amcharts Multiple lines

HTML

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

JavaScript

var chart;

var chartData = [{
    year: 2000,
    cars: 1587,
    motorcycles: 650,
    bicycles: 121},
{
    year: 1995,
    cars: 1567,
    motorcycles: 683,
    bicycles: 146},
{
    year: 1996,
    cars: 1617,
    motorcycles: 691,
    bicycles: 138},
{
    year: 1997,
    cars: 1630,
    motorcycles: 642,
    bicycles: 127},
{
    year: 1998,
    cars: 1660,
    motorcycles: 699,
    bicycles: 105},
{
    year: 1999,
    cars: 1683,
    motorcycles: 721,
    bicycles: 109},
{
    year: 2000,
    cars: 1691,
    motorcycles: 737,
    bicycles: 112},
{
    year: 2001,
    cars: 1298,
    motorcycles: 680,
    bicycles: 101},
{
    year: 2002,
    cars: 1275,
    motorcycles: 664,
    bicycles: 97},
{
    year: 2003,
    cars: 1246,
    motorcycles: 648,
    bicycles: 93},
{
    year: 2004,
    cars: 1218,
    motorcycles: 637,
    bicycles: 101},
{
    year: 2005,
    cars: 1213,
    motorcycles: 633,
    bicycles: 87},
{
    year: 2006,
    cars: 1199,
    motorcycles: 621,
    bicycles: 79},
{
    year: 2007,
    cars: 1110,
    motorcycles: 210,
    bicycles: 81},
{
    year: 2008,
    cars: 1165,
    motorcycles: 232,
    bicycles: 75},
{
    year: 2009,
    cars: 1145,
    motorcycles: 219,
    bicycles: 88},
{
    year: 2010,
    cars: 1163,
    motorcycles: 201,
    bicycles: 82},
{
    year: 2011,
    cars: 1180,
    motorcycles: 285,
    bicycles: 87},
{
    year: 2012,
    cars: 1159,
    motorcycles: 277,
    bicycles: 71}];

AmCharts.ready(function() {
    // SERIAL CHART
    chart = new AmCharts.AmSerialChart();
    
    chart.pathToImages = "http://www.amcharts.com/lib/images/";
    chart.zoomOutButton = {
        backgroundColor: '#000000',
        backgroundAlpha: 0.15
    };
    chart.dataProvider = chartData;
    chart.marginTop = 10;
    chart.autoMarginOffset = 3;
    chart.marginRight = 0;        
    chart.categoryField = "year";

    // AXES
    // Category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.gridAlpha = 0.07;
  ...