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Area Chart in EJ2 TypeScript Charts

3 Feb 202624 minutes to read

Area

To render an area series in your chart, you need to follow a few steps to configure it correctly. Here’s a concise guide on how to do this:

Set the series type: Define the series type as Area in your chart configuration. This indicates that the data should be represented as an area chart, which is ideal for showing trends over time or across categories, with filled areas beneath the lines representing data points.
Inject the AreaSeries module: Use the Chart.Inject(AreaSeries) method to inject the AreaSeries module into your chart. This step is essential, as it ensures that the necessary functionalities for rendering area series are available in your chart.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        // Series type as area series
        type: 'Area'
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Binding data with series

You can bind data to the chart using the dataSource property within the series configuration. This allows you to connect a JSON dataset or remote data to your chart. To display the data correctly, map the fields from the data to the chart series xName and yName properties.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        // Series type as area series
        type: 'Area'
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Series customization

The following properties can be used to customize the area series.

Fill

The fill property determines the color applied to the series.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Area',
        fill: '#69D2E7'
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

The fill property can be used to apply a gradient color to the area series. By configuring this property with gradient values, you can create a visually appealing effect in which the color transitions smoothly from one shade to another.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Area',
        fill: 'url(#gradient)'
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
    <svg style="width:1px; height:1px">
        <defs>
            <linearGradient id="gradient">
                <stop offset="0%" style="stop-color:blue;stop-opacity:5" />
                <stop offset="50%" style="stop-color:violet;stop-opacity:5" />
            </linearGradient>
        </defs>
    </svg>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Opacity

The opacity property controls the transparency of the fill and affects how the series blends with background or overlapping series.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Area',
        opacity: 0.5
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Area border

Use the border property to configure the border width, color, and dasharray of the area series.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Area',
        fill: '#69D2E7',
        border: { width: 2, color: '#962D18', dashArray: '5,5' }
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Multicolored area

To render a multicolored area series in your chart, you need to follow a few steps to configure it correctly. Here’s a concise guide on how to do this:

Set the series type: Define the series type as MultiColoredArea in your chart configuration. This specifies that the series should be rendered as a multicolored area chart, with different segments of the area having distinct colors.
Inject the MultiColoredAreaSeries module: Use the Chart.Inject(MultiColoredAreaSeries) method to inject the MultiColoredAreaSeries module into your chart. This step is essential, as it ensures that the necessary functionalities for rendering area series are available.
Customize the segments: Define the segments of the series using the segments property. Each segment can be customized with properties such as value, color, and dashArray.
- value - Specifies the endpoint of the segment.
- color - Defines the color of the segment.
- dashArray - Defines the dashes or gaps in the segment.

index.ts
index.html
datasource.ts
import { Chart, MultiColoredAreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(MultiColoredAreaSeries);

let chart: Chart = new Chart({
    series: [{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'MultiColoredArea',
        segmentAxis: 'X',
        segments: [
            {
                value: 2007,
                color: 'blue'
            },
            {
                value: 2009,
                color: 'lightgreen'
            },
            {
                color: 'orange'
            }
        ]
    }]
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 2005, y: 28 }, 
    { x: 2006, y: 25}, 
    { x: 2007, y: 26 }, 
    { x: 2008, y: 27 },
    { x: 2009, y: 32}, 
    { x: 2010, y: 35 }, 
    { x: 2011, y: 25 }
];

Empty points

Data points with null or undefined values are considered empty. Empty data points are ignored and not plotted on the chart.

Mode

Use the mode property to control handling of empty points. Available modes: Gap, Drop, Zero, Average. The default mode is Gap.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Area',
        emptyPointSettings: {
            mode: 'Gap'
        }
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: null },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Fill

Use the fill property to set the fill color for empty points.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Area',
        marker: { visible: true, width: 7, height: 7, isFilled: true },
        emptyPointSettings: {
            mode: 'Average',
            fill: 'red'
        }
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: null },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Border

Use the border property to customize the border width and color for empty points.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Area',
        marker: { visible: true, width: 7, height: 7, isFilled: true },
        emptyPointSettings: {
            mode: 'Average',
            fill: 'red',
            border: { width: 2, color: 'green' }
        }
    }],
    title: 'Average Sales Comparison'
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: null },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Events

Series render

The seriesRender event enables modification of series properties (for example, data, fill, or name) immediately before rendering. Use this event to adjust series appearance or to dynamically swap data sources.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries, ISeriesRenderEventArgs } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        // Series type as area series
        type: 'Area'
    }],
    title: 'Average Sales Comparison',
    seriesRender: (args: ISeriesRenderEventArgs) => {
        args.fill = '#ff6347';
    }
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

Point render

The pointRender event provides a hook to customize each data point (for example, marker shape, border, or fill) before it is drawn. Use this to apply per-point styling rules or conditional formatting.

index.ts
index.html
datasource.ts
import { Chart, AreaSeries, IPointRenderEventArgs } from '@syncfusion/ej2-charts';
import { chartData } from './datasource.ts';
Chart.Inject(AreaSeries);

let chart: Chart = new Chart({
    primaryXAxis: {
        title: 'Year',
        minimum: 1900, 
        maximum: 2000, 
        interval: 10,
        edgeLabelPlacement: 'Shift'
    },
    primaryYAxis: {
        minimum: 2, 
        maximum: 5, 
        interval: 0.5,
        title: 'Sales Amount in Millions'
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        marker: { visible: true },
        // Series type as area series
        type: 'Area'
    }],
    title: 'Average Sales Comparison',
    pointRender: (args: IPointRenderEventArgs) => {
        if (args.point.index % 2 !== 0) {
            args.fill = '#ff6347';
        }
        else {
            args.fill = '#009cb8';
        }
    }
}, '#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>
export let chartData: Object[] = [
    { x: 1900, y: 4 }, 
    { x: 1920, y: 3.0 },
    { x: 1940, y: 3.8 },
    { x: 1960, y: 3.4 }, 
    { x: 1980, y: 3.2 }, 
    { x: 2000, y: 3.9 }
];

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