Year Percent of GDP 2004-01-01 8.92284979999666 2005-01-01 11.40557264645920 2006-01-01 12.76927108734840 2007-01-01 12.75741172849170 2008-01-01 16.12536583395930 2009-01-01 23.79229276946310 2010-01-01 26.78702229475100 2011-01-01 25.74110426436900 2012-01-01 27.20071595150560 2013-01-01 28.19435097036870 2014-01-01 31.99912093176080 2015-01-01 35.10832451953360 2016-01-01 34.60699150184660 2017-01-01 25.05058954929880