V3: Column stacked

HTML

<script src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="http://www.amcharts.com/lib/3/serial.js"></script>
<div id="chartdiv" style="width: 100%; height: 362px;"></div>

JavaScript

var chart;

var chartData = [{
    "year": "SI業務部門",
        "全公司會議": 0,
        "部門會議": 4,
        "版本升級會議": 1,
        "週會": 1,
}, {
    "year": "大型業務部",
         "全公司會議": 3,
        "部門會議": 4,
        "講座": 1,
        "業務會議": 2,
}, {
    "year": "雲端事業部",
        "全公司會議": 1,
        "部門會議": 2,
        "版本升級會議": 3,
        "產品會議": 3,
}];

AmCharts.ready(function () {
    // SERIAL CHART
    chart = new AmCharts.AmSerialChart();
    chart.dataProvider = chartData;
    chart.categoryField = "year";
    chart.plotAreaBorderAlpha = 0.2;

    // AXES
    // category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.gridAlpha = 0.1;
    categoryAxis.axisAlpha = 0;
    categoryAxis.gridPosition = "start";

    // value
    var valueAxis = new AmCharts.ValueAxis();
    valueAxis.stackType = "regular";
    valueAxis.gridAlpha = 0.1;
    valueAxis.axisAlpha = 0;
    chart.addValueAxis(valueAxis);

   // GRAPHS
    // firstgraph 
    var graph = new AmCharts.AmGraph();
    graph.title = "全公司會議";
    graph.labelText = "[[value]]";
    graph.valueField = "全公司會議";
    graph.type = "column";
    graph.lineAlpha = 0;
    graph.fillAlphas = 1;
    graph.lineColor = "#C72C95";
    graph.balloonText = "<b><span style='color:#C72C95'>[[title]]</b></span><br><span style='font-size:14px'>[[category]]: <b>[[value]]</b></span>";
    chart.addGraph(graph);
    
    // second graph                              
    graph = new AmCharts.AmGraph();
    graph.title = "部門會議";
    graph.labelText = "[[value]]";
    graph.valueField = "部門會議";
    graph.type = "column";
    graph.lineAlpha = 0;
    graph.fillAlphas = 1;
    graph.lineColor = "#D8E0BD";
    graph.balloonText = "<b><span style='color:#afbb86'>[[title]]</b></span><br><span style='font-size:14px'>[[category]]: <b>[[value]]</b></span>";
    chart.addGraph(graph);
    
    // third graph              
    graph = new AmCharts.AmGraph();
    graph.title = "版本升級會議";
    graph.labelText = "[[value]]";
    graph.valueField =...