const chart = Highcharts.chart('container', {
    series: [{
        data: [
            29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1,
            95.6, 54.4
        ]
    }]
});

// button handler
let i = 0;
document.getElementById('button').addEventListener('click', () => {
    if (i === chart.series[0].data.length) {
        i = 0;
    }
    chart.series[0].data[i].select();
    i += 1;
});
