Year Percent of GDP 2010-01-01 2.2182 2011-01-01 2.5690 2012-01-01 2.8511 2013-01-01 3.5219 2014-01-01 2.6936 2015-01-01 2.9099 2016-01-01 2.3770 2017-01-01 2.6967