Automatic legend value width for pie chart

HTML

<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/pie.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		: 500px;
	font-size	: 11px;
}

JavaScript

// add a handler that we will trigger before the chart is created
AmCharts.addInitHandler(function (chart) {
    // find out the biggest value
    var maxValue = 0;
    for(var x in chart.dataProvider) {
        var value = chart.dataProvider[x][chart.valueField];
        if (value > maxValue)
            maxValue = value;
    }
    
    // set valueWidth according to the biggest value
    if (1000000000 <= maxValue)
        chart.legend.valueWidth = 100;
    else if (1000000 <= maxValue)
        chart.legend.valueWidth = 70;
    else if (1000 <= maxValue)
        chart.legend.valueWidth = 40;
}, ['pie']);

var chart = AmCharts.makeChart("chartdiv", {
    "type": "pie",	
	"theme": "none",
    "legend": {
        "markerType": "circle",
        "position": "right",
		"marginRight": 0,		
		"autoMargins": false,
        //valueWidth: 70,
    },
    "dataProvider": [{
        "country": "Czech Republic",
        "litres": 2560000.9
    }, {
        "country": "Ireland",
        "litres": 1310000.1
    }, {
        "country": "Germany",
        "litres": 1150000.8
    }, {
        "country": "Australia",
        "litres": 1090000.9
    }, {
        "country": "Austria",
        "litres": 1080000.3
    }, {
        "country": "UK",
        "litres": 650000
    }, {
        "country": "Belgium",
        "litres": 400000
    }],
    "valueField": "litres",
    "titleField": "country",
    "balloonText": "[[title]]<br><span style='font-size:14px'><b>[[value]]</b> ([[percents]]%)</span>",
    "exportConfig": {
        "menuTop":"0px",
        "menuItems": [{
            "icon": '/lib/3/images/export.png',
            "format": 'png'
        }]
    }
});