score:1

Accepted answer

You don't need to use the second series, use instead format for data labels.

    series: [{
        dataLabels: {
            format: '{point.y}%'
        },
        ...
    }]

Live demo: http://jsfiddle.net/BlackLabel/jhmfcty3/

API Reference: https://api.highcharts.com/highcharts/series.pie.dataLabels.format


Related Articles