Year Percent of GDP 2004-01-01 32.9241 2005-01-01 31.3677 2006-01-01 29.5676 2007-01-01 28.1035 2008-01-01 30.9268 2009-01-01 33.4030 2010-01-01 31.2144 2011-01-01 32.1085 2012-01-01 30.9559 2013-01-01 31.4340 2014-01-01 34.8463 2015-01-01 36.9836 2016-01-01 37.1138