Year Percent of GDP 2004-01-01 46.4634 2005-01-01 46.7108 2006-01-01 46.2411 2007-01-01 48.3819 2008-01-01 49.7995 2009-01-01 50.8480 2010-01-01 49.6943 2011-01-01 50.9810 2012-01-01 51.0713 2013-01-01 49.5864 2014-01-01 48.9433 2015-01-01 48.2776 2016-01-01 49.5750 2017-01-01 50.6332