"Stacked Area 100%" Charts pretty please!

Every single day at least once I badly miss "Stacked Area 100%" as chart type. Every single time I have to fire up Excel to make one. I wish that Workspace would have it.

Donuts are great, but they don't show development over time. Stacked Areas are great, but ratio changes are hard to read due to the altering amplitude. Can we please please get them?