Romney says he never paid less than 13% in taxes for any of the last 10 years. But how much would he pay each year once the Ryan plan is passed?

… And when, exactly, did he pay that at-least-13% per year?  Might some of it have been paid under the 2009 IRS amnesty plan for people who’d been hiding money in secret overseas bank accounts, after the Swiss banks suddenly agreed to reveal to the IRS the identities of American account holders?

Just wondering.