A stacked bar that adds up to 100%. Notice that I do not show percentages inside the column, the unit title "Percent" takes care of that. You need to fill in the totals on top of each column manually.
Use this chart to show market shares, or breakdowns of sales by regions, products, product segments, etc.
This version of the chart has 3 data series.
This layout is available either as a PowerPoint or Keynote template.