Year Percent of GDP 2004-01-01 46.3314 2005-01-01 49.4103 2006-01-01 51.9847 2007-01-01 50.2227 2008-01-01 49.7000 2009-01-01 49.6287 2010-01-01 53.0702 2011-01-01 55.7981 2012-01-01 58.8378 2013-01-01 56.2055 2014-01-01 52.9199 2015-01-01 53.8322 2016-01-01 52.2012 2017-01-01 51.3598