amcharts Column chart with multiple datasets

by roberts gailitis

HTML

<script src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="http://www.amcharts.com/lib/3/serial.js"></script>
<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" />
<script src="https://www.amcharts.com/lib/3/themes/light.js"></script>
<div id="chartdiv"></div>																					
<div id="$selector$">Select a dataset:
    &nbsp;&nbsp;&nbsp;
    <label><input type="radio" value="0" name="dataset" checked="checked" onclick="selectDataset(0);" /> Size of world fleet in DWT 000' tonnes</label>
    &nbsp;&nbsp;&nbsp;
    <label><input type="radio" value="1" name="dataset" onclick="selectDataset(1);" /> Growth of world fleet in % </label>
</div>
<div id="$CHART$" style="width: 100%; height: 600px;"></div>
<div> 
<ul>
  <li> <button id="button1" style="font-size: 14px; padding: 5px 12px;"> <b> 1980 - 1987</b> </button> - Decrease of tanker fleet </li> 
  <li> <button id="button2" style="font-size: 14px; padding: 5px 12px;"><b>1987 - 2010 </b> </button>  - Correlation between tankers and (large) bulkcarriers </li>
  <li> <button  id="button3"style="font-size: 14px; padding: 5px 12px;"> <b>2010 - 2016</b> </button> - Boom of bulk cargo fleet  </li>
 </ul>
  </div>

CSS

#selector {
    font-family: Verdana;
    background-color: #efefef;
    padding: 10px;
    margin-bottom: 10px;
    border-bottom: 1px solid #ccc;
}

JavaScript

var chartData = [
  [
   { 'year': '1980','Total fleet': '672142.5','Oil tankers': '337895.6','Bulk carriers': '181880.3','General cargo': '112840.9','Container ships': '10290.11','Other types of ships': '29235.64' },
{ 'year': '1981','Total fleet': '679704.8','Oil tankers': '338616.3','Bulk carriers': '184501.2','General cargo': '114832.9','Container ships': '11060.52','Other types of ships': '30693.84' },
{ 'year': '1982','Total fleet': '686028.9','Oil tankers': '334237.8','Bulk carriers': '193217.2','General cargo': '113293.8','Container ships': '12108.26','Other types of ships': '33171.79' },
{ 'year': '1983','Total fleet': '690093.1','Oil tankers': '323668.2','Bulk carriers': '204630.7','General cargo': '113269.1','Container ships': '12809.77','Other types of ships': '35715.38' },
{ 'year': '1984','Total fleet': '681538.9','Oil tankers': '304466.3','Bulk carriers': '212915.2','General cargo': '111863','Container ships': '14088.79','Other types of ships': '38205.51' },
{ 'year': '1985','Total fleet': '668140.1','Oil tankers': '284945.9','Bulk carriers': '218518.1','General cargo': '108308.4','Container ships': '17266.77','Other types of ships': '39101.01' },
{ 'year': '1986','Total fleet': '654327.4','Oil tankers': '258932.4','Bulk carriers': '227550.8','General cargo': '103921','Container ships': '18732.55','Other types of ships': '45190.68' },
{ 'year': '1987','Total fleet': '632237.8','Oil tankers': '238144.5','Bulk carriers': '226967.4','General cargo': '100222','Container ships': '20180.65','Other types of ships': '46723.25' },
{ 'year': '1988','Total fleet': '625045.8','Oil tankers': '234908.4','Bulk carriers': '223659.1','General cargo': '97110.25','Container ships': '21489.53','Other types of ships': '47878.48' },
{ 'year': '1989','Total fleet': '620734.2','Oil tankers': '233608.5','Bulk carriers': '222432','General cargo': '93795.68','Container ships': '22295.22','Other types of ships': '48602.75' },
{ 'year': '1990','Total fleet': '629976','Oil...