Year Percent of GDP 2000-01-01 21.5980 2001-01-01 25.2285 2002-01-01 21.3328 2003-01-01 20.0500 2004-01-01 17.7074 2005-01-01 15.7437 2006-01-01 15.6272 2007-01-01 17.6546 2008-01-01 21.9500 2009-01-01 34.9969 2010-01-01 32.2203 2011-01-01 31.1498 2012-01-01 29.1237 2013-01-01 30.3024 2014-01-01 33.1224 2015-01-01 32.3765 2016-01-01 32.3037 2017-01-01 32.0720 2018-01-01 30.9926 2019-01-01 30.0532