Year Percent of GDP 2004-01-01 9.2902 2005-01-01 14.9682 2006-01-01 21.7892 2007-01-01 29.9015 2008-01-01 36.1647 2009-01-01 37.4629 2010-01-01 37.7606 2011-01-01 40.4027 2012-01-01 40.3572 2013-01-01 39.3839 2014-01-01 39.0456 2015-01-01 36.8970 2016-01-01 35.8078