Year Percent of GDP 2004-01-01 23.0273113360059 2005-01-01 22.6878392876571 2006-01-01 22.0907100394610 2007-01-01 23.4431096392506 2008-01-01 26.1128564500238 2009-01-01 25.7802591054252 2010-01-01 28.0327433873964 2011-01-01 31.2067850966344 2012-01-01 30.1281777820053 2013-01-01 32.4912379266623 2014-01-01 34.8803174569477 2015-01-01 34.7913006225529 2016-01-01 31.6324106936148 2017-01-01 28.4316502108095