So how much did President Obama donate to charity before running for office?

The big news today is that the Whitehouse released Pres. Obama's tax returns for 2011.  Notably, he donated 21.8% of his income to charity last year.

But what did President Obama's charitable contributions look like in prior years?  Below is a chart showing his income and chartable donations since 2000 (courtesy of TaxProf Blog). 

Obama Tax Returns (041312)

I won't attach Joe Biden's chart as its hard to deviate from a high of 1.45%.