3D Clustered Column Chart

HTML

<script src="http://www.amcharts.com/lib/3/serial.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/serial.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/themes/none.js"></script>
<div id="chartdiv"></div>

CSS

#chartdiv {
  width: 100%;
  height: 435px;
  font-size: 11px;
}

JavaScript

var chart = AmCharts.makeChart("chartdiv", {
  "type": "serial",
  "categoryField": "column 1",
  "dataDateFormat": "DD.MM.YY",
  "startDuration": 1,
  "categoryAxis": {
    "gridPosition": "start"
  },
  "chartScrollbar": {
    "enabled": true,
    "graphType": "line",
    "maximum": 50,
    "minimum": 10
  },
  "trendLines": [],
  "graphs": [{
    "type": "column",
    "fillAlphas": 1,
    "id": "AmGraph-1",
    "showAllValueLabels": true,
    "tabIndex": 4,
    "title": "graph 1",
    "type": "column",
    "valueAxis": "ValueAxis-1",
    "valueField": "column 2"
  }, {
    "bullet": "round",
    "id": "AmGraph-2",
    "lineThickness": 2,
    "title": "graph 2",
    "valueAxis": "ValueAxis-1",
    "valueField": "column 3"
  }],
  "guides": [],
  "valueAxes": [{
    "id": "ValueAxis-1",
    "title": "Axis title"
  }],
  "allLabels": [],
  "balloon": {},
  "legend": {
    "enabled": true,
    "useGraphSettings": true
  },
  "titles": [{
    "id": "Title-1",
    "size": 15,
    "text": "Chart Title"
  }],
  "dataProvider": [{
    "column 1": "01.01.90",
    "column 2": "1251",
    "column 3": "1126",
    "": ""
  }, {
    "column 1": "02.01.90",
    "column 2": "1394",
    "column 3": "1324",
    "": ""
  }, {
    "column 1": "03.01.90",
    "column 2": "1593",
    "column 3": "1641",
    "": ""
  }, {
    "column 1": "04.01.90",
    "column 2": "1472",
    "column 3": "1457",
    "": ""
  }, {
    "column 1": "05.01.90",
    "column 2": "1939",
    "column 3": "2075",
    "": ""
  }, {
    "column 1": "06.01.90",
    "column 2": "1293",
    "column 3": "1345",
    "": ""
  }, {
    "column 1": "07.01.90",
    "column 2": "1284",
    "column 3": "1284",
    "": ""
  }, {
    "column 1": "08.01.90",
    "column 2": "1296",
    "column 3": "1166",
    "": ""
  }, {
    "column 1": "09.01.90",
    "column 2": "1851",
    "column 3": "1666",
    "": ""
  }, {
    "column 1": "10.01.90",
    "column 2": "1170",
    "column 3": "1065",
    "": ""
  }, {
    "column 1":...