Year Percent of GDP 2004-01-01 12.2515339966833 2005-01-01 12.5316111111111 2006-01-01 11.9245485911443 2007-01-01 12.2805022266730 2008-01-01 14.2913373634312 2009-01-01 12.4489270526660 2010-01-01 12.7979744579745 2011-01-01 13.8991072863741 2012-01-01 15.5294710671148 2013-01-01 16.2151684937150 2014-01-01 16.5210268544224 2015-01-01 18.3630059732758 2016-01-01 18.3726750155261 2017-01-01 18.1283652005378 2018-01-01 18.4907808203088 2019-01-01 17.9901608811467