Year Percent of GDP 2002-01-01 11.6162283783784 2003-01-01 24.1901018053597 2004-01-01 29.1152937757936 2005-01-01 35.8702090907937 2006-01-01 43.5560524508393 2007-01-01 41.6827191039604 2008-01-01 40.7574197083555 2009-01-01 40.5520006372722 2010-01-01 48.3009084148607 2011-01-01 39.5214318173207 2012-01-01 45.6609097980014 2013-01-01 48.6014869252669 2015-01-01 51.4705801646643 2016-01-01 52.8842449214186