Year Percent of GDP 2004-01-01 25.2529 2005-01-01 25.7630 2006-01-01 25.1057 2007-01-01 27.7548 2008-01-01 31.7752 2009-01-01 33.7117 2010-01-01 36.8621 2011-01-01 33.4649 2012-01-01 34.1954 2013-01-01 33.6911 2014-01-01 38.0267 2015-01-01 35.7862 2016-01-01 33.9518 2017-01-01 17.6897