Finance ministers and central bank governors pose for a group photo following the G20 Finance Ministers and Central Bank Governors Meeting during the International Monetary Fund (IMF) and World Bank spring meetings, in Washington D.C., capital of the United States, on April 19, 2013. (Xinhua/Wang Yiou)

Russian Finance Minister Anton Siluanov (L), chair of the G20, and Sergey Ignatiev, chairman of the Bank of Russia, pose for a group photo following the G20 Finance Ministers and Central Bank Governors Meeting during the International Monetary Fund (IMF) and World Bank spring meetings, in Washington D.C., capital of the United States, on April 19, 2013. (Xinhua/Wang Yiou)

U.S. Treasury Secretary Jacob Lew (R) and British Cancellor of the Exchequer George Osborne chat before having a group photo taken following the G20 Finance Ministers and Central Bank Governors Meeting during the International Monetary Fund (IMF) and World Bank spring meetings, in Washington D.C., capital of the United States, on April 19, 2013. (Xinhua/Wang Yiou)

People's Bank of China (PBOC) Governor Zhou Xiaochuan (R) talks with U.S. Federal Reserve Chairman Ben Bernanke before having a group photo taken following the G20 Finance Ministers and Central Bank Governors Meeting during the International Monetary Fund (IMF) and World Bank spring meetings, in Washington D.C., capital of the United States, on April 19, 2013. (Xinhua/Wang Yiou)

International Monetary Fund (IMF) Managing Director Christine Lagarde poses for a group photo following the G20 Finance Ministers and Central Bank Governors Meeting during the International Monetary Fund (IMF) and World Bank spring meetings, in Washington D.C., capital of the United States, on April 19, 2013. (Xinhua/Wang Yiou)

Chinese Finance Minister Lou Jiwei is interviewed during the G20 Finance Ministers and Central Bank Governors Meeting at the International Monetary Fund headquarters on April 19, 2013 in Washington D.C. during the International Monetary Fund (IMF) and World Bank spring meetings. (Xinhua/Fang Zhe)

Chinese Finance Minister Lou Jiwei (R) talks with U.S. Treasury Secretary Jacob Lew (L) after a group photo during the G20 Finance Ministers and Central Bank Governors Meeting at the International Monetary Fund headquarters on April 19, 2013 in Washington D.C. during the International Monetary Fund (IMF) and World Bank spring meetings. (Xinhua/Fang Zhe)

Chinese Finance Minister Lou Jiwei (R) talks with U.S. Treasury Secretary Jacob Lew (L) after a group photo during the G20 Finance Ministers and Central Bank Governors Meeting at the International Monetary Fund headquarters on April 19, 2013 in Washington D.C. during the International Monetary Fund (IMF) and World Bank spring meetings. (Xinhua/Fang Zhe)

Chinese Finance Minister Lou Jiwei (R) talks with U.S. Treasury Secretary Jacob Lew (L) after a group photo during the G20 Finance Ministers and Central Bank Governors Meeting at the International Monetary Fund headquarters on April 19, 2013 in Washington D.C. during the International Monetary Fund (IMF) and World Bank spring meetings. (Xinhua/Fang Zhe)