Year Percent of GDP 2009-01-01 7.0333 2010-01-01 14.0705 2011-01-01 17.9044 2012-01-01 20.3660 2013-01-01 19.5330 2014-01-01 18.3779 2015-01-01 16.9713 2016-01-01 17.0090