Year Percent of GDP 2004-01-01 25.0504981266843 2005-01-01 22.3842240950406 2006-01-01 23.9143517235674 2007-01-01 20.7809631873709 2008-01-01 21.2438305366035 2009-01-01 24.6767047638207 2010-01-01 25.5235946259596 2011-01-01 32.1076664071166 2012-01-01 37.0979753483865 2013-01-01 34.0811183549000 2014-01-01 37.9819342991720 2015-01-01 39.4170415416963 2016-01-01 37.9986804761696 2017-01-01 39.0000070644325 2018-01-01 39.4739992660657 2019-01-01 39.3696589412919