Year Percent of GDP 2004-01-01 32.0844 2005-01-01 32.5473 2006-01-01 33.3532 2007-01-01 33.1454 2008-01-01 32.2134 2009-01-01 37.6439 2010-01-01 49.1186 2011-01-01 48.5723 2012-01-01 53.5045 2013-01-01 55.0197 2014-01-01 56.2082 2015-01-01 56.7538 2016-01-01 55.0384