Year Percent of GDP 2004-01-01 3.2418 2005-01-01 4.4440 2006-01-01 5.5689 2007-01-01 6.2154 2008-01-01 6.3274 2009-01-01 5.9589 2010-01-01 5.7427 2011-01-01 6.2430 2012-01-01 6.7158 2013-01-01 7.3575 2014-01-01 7.3921 2015-01-01 7.7875 2016-01-01 8.1113