13.9%

That's the effective rate that Mitt Romney paid in Federal Income Taxes in 2010 on $21.6 million in income, according to his just-released returns.  He estimates a 15.4 rate on $20.9 million in 2011.  His returns also revealed vast holdings in the Cayman Islands and in a Swiss bank account that he closed after an investment advisor decided that it could be politically sensitive. 

Keep in mind that Romney only released any of this after pressure from Newt Gingrich.  This makes it look like he had something to hide, thus the returns will be subject to greater scrutiny than if he had quietly released them earlier.