Stacked Area 100% Charts
Stacked Areas 100% charts are a variation of Stacked Area charts that present values for trends as percentages, totaling to 100% for each category
To create a Vertical Stacked Area 100% Chart set the SeriesOrientation property to Vertical. Set the RadChart DefaultType property or ChartSeries.Type to StackedArea100.
To create a Horizontal Stacked Area 100% Chart set the SeriesOrientation property to Horizontal. Set the RadChart DefaultType property or ChartSeries.Type to StackedArea100.
To display the label values as percentages, change the DefaultLabelValue for each chart series from "#Y" (the numeric value for each data point) to "#%" (the percentage of each data point to the category).