Year Percent of GDP 2004-01-01 19.4508 2005-01-01 21.4591 2006-01-01 22.9095 2007-01-01 23.5245 2008-01-01 25.4043 2009-01-01 28.6192 2010-01-01 29.7584 2011-01-01 27.1130 2012-01-01 29.6717 2013-01-01 29.6319 2014-01-01 28.9876 2015-01-01 29.4047 2016-01-01 17.1399 2017-01-01 9.1175