rotated datalabels bottom

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<div id="container" style="height: 400px"></div>

JavaScript

$(function () {
    $('#container').highcharts({
        chart: {
            type: 'column'
        },
        title: {
            text: 'Data labels box options'
        },

        xAxis: {
            categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
        },

        plotOptions: {
            series: {
                dataLabels: {
                    rotation: 270,
                    inside: false,
                    enabled: true
                }
            }
        },

        series: [{
            data: [{
                name: 'Point 1',
                y: 10,
                dataLabels: {y: 100}
            }, {
                name: 'Point 2',
                y: 15,
                dataLabels: {y: 165}
            }]
        }]

    });
});