Year Percent of GDP 2004-01-01 14.3909 2005-01-01 17.5316 2006-01-01 21.0387 2007-01-01 20.5793 2008-01-01 24.2883 2009-01-01 39.5033 2010-01-01 35.1138 2011-01-01 36.7791 2012-01-01 35.8979 2013-01-01 38.5078 2014-01-01 42.9368 2015-01-01 49.5822 2016-01-01 44.8112