Year Percent of GDP 2004-01-01 18.9553 2005-01-01 17.9533 2006-01-01 17.1156 2007-01-01 18.1539 2008-01-01 19.6200 2009-01-01 20.4067 2010-01-01 20.6807 2011-01-01 20.3758 2012-01-01 20.6008 2013-01-01 21.2495 2014-01-01 22.1150 2015-01-01 23.5219 2016-01-01 24.7189