Year Percent of GDP 2004-01-01 2.7719 2005-01-01 3.1184 2006-01-01 3.6513 2007-01-01 4.4254 2008-01-01 8.5038 2009-01-01 9.9130 2010-01-01 11.0870 2011-01-01 12.1974 2012-01-01 12.2637 2013-01-01 13.2360 2014-01-01 14.2401 2015-01-01 15.2086