Year Percent of GDP 2004-01-01 14.4032247969989 2005-01-01 16.1934843378682 2006-01-01 15.9306635782231 2007-01-01 17.1357815011496 2008-01-01 18.3031648144437 2009-01-01 19.3800069593409 2010-01-01 21.7900897948374 2011-01-01 18.3772011094266 2012-01-01 18.2662370373195 2013-01-01 21.5897917793712 2014-01-01 21.8226276515345 2015-01-01 21.0966021598046 2016-01-01 20.8403416519145 2017-01-01 21.8047564028796 2018-01-01 21.9392138156579 2019-01-01 21.6917147026940