Year Percent of GDP 2004-01-01 28.3663 2005-01-01 30.6913 2006-01-01 32.0227 2007-01-01 31.1374 2008-01-01 33.1788 2009-01-01 34.5372 2010-01-01 39.1035 2011-01-01 41.4397 2012-01-01 41.5005 2013-01-01 38.7832 2014-01-01 40.2783 2015-01-01 40.6830 2016-01-01 40.4845