$chart = new Highchart();

$chart->chart->renderTo = "container";
$chart->chart->type = "area";
$chart->title->text = "US and USSR nuclear stockpiles";
$chart->subtitle->text = "Source: <a href=\"http://thebulletin.metapress.com/content/c4120650912x74k7/fulltext.pdf\">thebulletin.metapress.com</a>";
$chart->xAxis->labels->formatter = new HighchartJsExpr("function() { return this.value;}");
$chart->yAxis->title->text = "Nuclear weapon states";
$chart->yAxis->labels->formatter = new HighchartJsExpr("function() { return this.value / 1000 +'k';}");
$chart->tooltip->formatter = new HighchartJsExpr(
    "function() {
                              return this.series.name +' produced <b>'+
                              Highcharts.numberFormat(this.y, 0) +'</b><br/>warheads in '+ this.x;}");
$chart->plotOptions->area->pointStart = 1940;
$chart->plotOptions->area->marker->enabled = false;
$chart->plotOptions->area->marker->symbol = "circle";
$chart->plotOptions->area->marker->radius = 2;
$chart->plotOptions->area->marker->states->hover->enabled = true;

$chart->series[] = array(
    'name' => 'USA',
    'data' => array(
        null,
        null,
        null,
        null,
        null,
        6,
        11,
        32,
        110,
        235,
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        2063,
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        4618,
        6444,
        9822,
        15468,
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        24126,
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        29459,
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        31982,
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        26956,
        27912,
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        28965,
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        25579,
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        24304,
        23464,
        23708,
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        24357,
        24237,
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        10871,
        10824,
        10577,
        10527,
        10475,
        10421,
        10358,
        10295,
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    )
);

$chart->series[] = array(
    'name' => 'USSR/Russia',
    'data' => array(
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
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        18000,
        18000,
        17000,
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    )
);