Year Percent of GDP 2004-01-01 15.9450610463534 2005-01-01 15.1713897505417 2006-01-01 14.3981235638242 2007-01-01 15.1468363147651 2008-01-01 15.4388611534246 2009-01-01 13.3359553232722 2010-01-01 14.2045162982854 2011-01-01 17.1174167570132 2012-01-01 16.9897169858564 2013-01-01 16.1780947698524 2014-01-01 18.1362913325757 2015-01-01 18.5685707029244 2016-01-01 17.9939630603995 2017-01-01 17.3946833798105 2018-01-01 17.1954564592840 2019-01-01 16.1150911629281