Layered Column Chart
With amCharts library you can easily produce layered column or bar chart with any number of layers. The trick is simple, you should set clustered property of a graph to false. Besides that you might want to make columns of the graph more narrow – set columnWidth to a smaller than default value, like 0.5.
Demo source
<!-- Styles -->
<style>
#chartdiv {
width : 100%;
height : 500px;
font-size : 11px;
}
</style>
<!-- Resources -->
<script src="https://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="https://www.amcharts.com/lib/3/serial.js"></script>
<script src="https://www.amcharts.com/lib/3/plugins/export/export.min.js"></script>
<link rel="stylesheet" href="https://www.amcharts.com/lib/3/plugins/export/export.css" type="text/css" media="all" />
<!-- Chart code -->
<script>
var chart = AmCharts.makeChart("chartdiv", {
"theme": "none",
"type": "serial",
"dataProvider": [{
"country": "USA",
"year2004": 3.5,
"year2005": 4.2
}, {
"country": "UK",
"year2004": 1.7,
"year2005": 3.1
}, {
"country": "Canada",
"year2004": 2.8,
"year2005": 2.9
}, {
"country": "Japan",
"year2004": 2.6,
"year2005": 2.3
}, {
"country": "France",
"year2004": 1.4,
"year2005": 2.1
}, {
"country": "Brazil",
"year2004": 2.6,
"year2005": 4.9
}],
"valueAxes": [{
"unit": "%",
"position": "left",
"title": "GDP growth rate",
}],
"startDuration": 1,
"graphs": [{
"balloonText": "GDP grow in [[category]] (2004): <b>[[value]]</b>",
"fillAlphas": 0.9,
"lineAlpha": 0.2,
"title": "2004",
"type": "column",
"valueField": "year2004"
}, {
"balloonText": "GDP grow in [[category]] (2005): <b>[[value]]</b>",
"fillAlphas": 0.9,
"lineAlpha": 0.2,
"title": "2005",
"type": "column",
"clustered":false,
"columnWidth":0.5,
"valueField": "year2005"
}],
"plotAreaFillAlphas": 0.1,
"categoryField": "country",
"categoryAxis": {
"gridPosition": "start"
},
"export": {
"enabled": true
}
});
</script>
<!-- HTML -->
<div id="chartdiv"></div> 