Mexico's President Felipe Calderon (C) gives a speech during the Group of Twenty (G20) leading economies' finance ministers and central bankers meeting in Mexico City February 25, 2012. REUTERS/Ariel ... more 

Mexico's President Felipe Calderon (C) gives a speech during the Group of Twenty (G20) leading economies' finance ministers and central bankers meeting in Mexico City February 25, 2012. REUTERS/Ariel Gutierrez/Presidential Palace/Handout (MEXICO - Tags: POLITICS BUSINESS) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less