Year Percent of GDP 2006-01-01 6.9695 2007-01-01 8.0711 2008-01-01 7.8476 2009-01-01 7.4699 2010-01-01 9.6203 2011-01-01 10.3784 2012-01-01 11.0515 2013-01-01 13.1423 2014-01-01 14.5890 2015-01-01 15.0157 2016-01-01 14.7364 2017-01-01 17.9375