Year Percent of GDP 2008-01-01 18.5464 2009-01-01 17.4297 2010-01-01 15.7751 2011-01-01 13.2742 2012-01-01 12.9613 2013-01-01 13.9894 2014-01-01 13.0814 2015-01-01 13.7068 2016-01-01 14.1993