The Spline Stacked Area 100% chart is a variation of the Spline Area chart. The areas are stacked so that each series adjoins but does not overlap the preceding series and where the combined total for each category is 100 percent.
Also can be used for data modelling in that it takes a limited number of data points and interpolates the intervening values. This chart type allows the entire surface area for all sequences to be displayed at one time. Use this chart type when the relationship between values in a category is more significant than the amounts.
In the example below the actual meters drilled area is compared to and stacked above the YTD monthly target drill meters area and proportioned over a 100%.