Year Percent of GDP 2004-01-01 69.0268 2005-01-01 71.9585 2006-01-01 71.4865 2007-01-01 74.0327 2008-01-01 77.4236 2009-01-01 80.7114 2010-01-01 77.6788 2011-01-01 76.8034 2012-01-01 77.1548 2013-01-01 77.5738 2014-01-01 73.7548 2015-01-01 73.3946 2016-01-01 76.2135 2017-01-01 78.1587