2.1.957 Part 1 Section 20.8, chart:data-label-number
a. The standard defines the attribute chart:data-label-number
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This attribute is supported in Excel 2013, Excel 2016, and Excel 2019.
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On load Excel applies the "percentage" value only if the chart type is chart:circle or chart:ring. Also, Excel applies the "percentage" value if the chart contains a circle or ring series when the attribute is on the style of the chart:plot-area.
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On save Excel writes the "percentage" value only if the series type is pie or doughnut in Excel.