Year Percent of GDP 2004-01-01 28.0586758275215 2005-01-01 26.8101503993685 2006-01-01 25.5478305265016 2007-01-01 25.2074957787693 2008-01-01 27.8863230564637 2009-01-01 31.1963895306992 2010-01-01 32.7250386774066 2011-01-01 36.7630987836643 2012-01-01 33.7824560427923 2013-01-01 35.4795720379704 2014-01-01 39.7921879272286 2015-01-01 41.3546859120150 2016-01-01 39.0087349317710 2017-01-01 36.3946340580164 2018-01-01 37.8001043913497 2019-01-01 38.3246325413847