Highcharts.chart('container', {
    chart: {
        type: 'pie'
    },

    title: {
        text: 'Pie with startAngle = 90'
    },

    plotOptions: {
        pie: {
            startAngle: 90
        }
    },

    series: [{
        data: [
            ['Firefox', 44.2],
            ['IE7',     26.6],
            ['IE6',     20],
            ['Chrome',  3.1],
            ['Other',   5.4]
        ]
    }]
});