According to the IMF in 2009 the UK economy ranks 6th in the world with a GDP PPP of 2.1 trillion and GDP PPP per capita of 34,388 vs 45,934 (United States) Its central bank interest rate are set at 0.5% by the Bank of England. Its currency the Pound Sterling (£) is the 4th most traded currency in the world. According to CIA.gov its inflation was 3.6% in 2008 and 2.2% in 2009.