Year Percent of GDP 2004-01-01 22.6625 2005-01-01 24.6596 2006-01-01 28.2342 2007-01-01 37.5690 2008-01-01 36.7623 2009-01-01 36.1856 2010-01-01 33.8500 2011-01-01 36.2040 2012-01-01 39.6497 2013-01-01 41.9633 2014-01-01 35.3962 2015-01-01 29.6988 2016-01-01 24.8037 2017-01-01 24.8916