score:1

Accepted answer

assign your grouppadding value very close to zero (or zero).

plotoptions: {
        series: {
            grouppadding: 0.01
        }
    },

since you didn't post your code, i'll show another example

score:1

you can increase the column width by using pointwidth and shrink the spaces between years using grouppadding.

http://api.highcharts.com/highcharts#plotoptions.column.pointwidth

plotoptions: {
        series: {
            grouppadding: 0.01,
            pointwidth: 50
        }
    }

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