amcharts Line with reversed value axis

HTML

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

JavaScript

var chart;

var chartData = [{
    year: 1930,
    italy: 1,
    germany: 5,
    uk: 3},
{
    year: 1934,
    italy: 1,
    germany: 2,
    uk: 6},
{
    year: 1938,
    italy: 2,
    germany: 3,
    uk: 1},
{
    year: 1950,
    italy: 3,
    germany: 4,
    uk: 1},
{
    year: 1954,
    italy: 5,
    germany: 1,
    uk: 2},
{
    year: 1958,
    italy: 3,
    germany: 2,
    uk: 1},
{
    year: 1962,
    italy: 1,
    germany: 2,
    uk: 3},
{
    year: 1966,
    italy: 2,
    germany: 1,
    uk: 5},
{
    year: 1970,
    italy: 3,
    germany: 5,
    uk: 2},
{
    year: 1974,
    italy: 4,
    germany: 3,
    uk: 6},
{
    year: 1978,
    italy: 1,
    germany: 2,
    uk: 4}];


AmCharts.ready(function() {
    // SERIAL CHART
    chart = new AmCharts.AmSerialChart();
    chart.dataProvider = chartData;
    chart.marginRight = 0;
    chart.autoMarginOffset = 5;
    chart.categoryField = "year";
    chart.startDuration = 0.5;
    chart.balloon.color = "#000000";

    // AXES
    // category
    var categoryAxis = chart.categoryAxis;
    categoryAxis.fillAlpha = 1;
    categoryAxis.fillColor = "#FAFAFA";
    categoryAxis.gridAlpha = 0;
    categoryAxis.axisAlpha = 0;
    categoryAxis.gridPosition = "start";
    categoryAxis.position = "top";

    // value
    var valueAxis = new AmCharts.ValueAxis();
    valueAxis.title = "Place taken";
    valueAxis.dashLength = 5;
    valueAxis.axisAlpha = 0;
    valueAxis.minimum = -1;
    valueAxis.maximum = 10;
//    valueAxis.integersOnly = true;
//    valueAxis.gridCount = 10;
    valueAxis.reversed = true; // this line makes the value axis reversed
    chart.addValueAxis(valueAxis);

    // GRAPHS
    // Italy graph                                            
    var graph = new AmCharts.AmGraph();
    graph.title = "Italy";
    graph.valueField = "italy";
//    graph.hidden = true; // this line makes the graph initially hidden           
    graph.balloonText = "place taken by Italy in [[category]]: [[value]]";
   ...