Year Percent of GDP 2004-01-01 16.4950603662040 2005-01-01 17.0758188046934 2006-01-01 16.1951598699235 2007-01-01 16.9334798101258 2008-01-01 15.3987924484597 2009-01-01 14.9004897514290 2010-01-01 15.6257960302728 2011-01-01 16.4590536253818 2012-01-01 16.3510034177504 2013-01-01 15.7081893716949 2014-01-01 16.6109347263372 2015-01-01 17.0755520452199 2016-01-01 18.5776784345442 2017-01-01 17.2206548156912 2018-01-01 17.3349347262450 2019-01-01 17.4945585555884