Year Percent of GDP 2004-01-01 18.4665957390614 2005-01-01 18.3149774226569 2006-01-01 20.1829944547135 2007-01-01 20.9855217013305 2008-01-01 23.1501652763139 2009-01-01 20.7048993949380 2010-01-01 19.5129819443823 2011-01-01 19.7209490223600 2012-01-01 19.9659511250051 2013-01-01 21.1635555824233 2014-01-01 20.4994929505809 2015-01-01 20.9796821905203 2016-01-01 19.3530800305449 2017-01-01 18.5591269929988 2018-01-01 18.1165507756692 2019-01-01 17.9833844953157