score:3

Accepted answer

add 'viewdata' to menuitems:

exporting: {
    buttons: {
        contextbutton: {
            menuitems: ['downloadpdf', 'downloadcsv', 'viewdata']
        }
    }
}

live demo: http://jsfiddle.net/blacklabel/na3v216l/

score:0

you have to add

<script src="https://code.highcharts.com/modules/export-data.js"></script>

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