In 2010, he made $21,646,507 and paid under 14% in taxes. All calculations on the site are based on that figure. We would use a more recent year or an average of other years, but he won’t release any more tax returns.
That last part is no longer true, as he released his 2011 tax returns. Still, it would be nice to see his returns from the years during which he wasn’t running for office, for Pete’s sake.