Year Percent of GDP 2007-01-01 0.7585 2008-01-01 6.7083 2009-01-01 16.5315 2010-01-01 23.1035 2011-01-01 31.3788 2012-01-01 36.0793 2013-01-01 40.0741 2014-01-01 43.9025 2015-01-01 44.9810 2016-01-01 46.8741