Year Percent of GDP 2004-01-01 0.0086 2005-01-01 0.0306 2006-01-01 0.0524 2007-01-01 0.1803 2008-01-01 0.1442 2009-01-01 0.2883 2010-01-01 0.2286 2011-01-01 0.3016 2012-01-01 0.3731 2013-01-01 0.4230 2014-01-01 0.6400 2015-01-01 1.0015 2016-01-01 1.0482 2017-01-01 1.1993