Year Percent of GDP 2009-01-01 0.2583 2010-01-01 0.3203 2011-01-01 0.3204 2012-01-01 0.3200 2013-01-01 0.3794 2014-01-01 0.4132 2015-01-01 0.4470 2016-01-01 0.4911