Year Percent of GDP 2004-01-01 0.2577 2005-01-01 0.2375 2006-01-01 0.2996 2007-01-01 0.3517 2008-01-01 0.4723 2009-01-01 0.4938 2010-01-01 0.5392 2011-01-01 0.6622 2012-01-01 0.6990 2013-01-01 0.7949 2014-01-01 0.8582 2015-01-01 0.8227 2016-01-01 0.7570 2017-01-01 0.9983