Year Percent of GDP 2004-01-01 49.1657 2005-01-01 52.6578 2006-01-01 58.3130 2007-01-01 63.7371 2008-01-01 58.4840 2009-01-01 58.7602 2010-01-01 64.0286 2011-01-01 68.3649 2012-01-01 70.9122 2013-01-01 72.1399 2014-01-01 72.9462 2015-01-01 72.4369 2016-01-01 73.6859