Year Percent of GDP 2010-01-01 6.2808 2011-01-01 6.8201 2012-01-01 7.3110 2013-01-01 7.8092 2014-01-01 8.3568 2015-01-01 8.2622 2016-01-01 7.6799 2017-01-01 7.6139