Year Percent of GDP 2004-01-01 147.0702 2005-01-01 147.6181 2006-01-01 146.0539 2007-01-01 147.9260 2008-01-01 145.8014 2009-01-01 153.7688 2010-01-01 151.8934 2011-01-01 154.2717 2012-01-01 160.3991 2013-01-01 164.6869 2014-01-01 166.5870 2015-01-01 167.7877 2016-01-01 171.4399