Year Percent of GDP 2000-01-01 33.1332 2001-01-01 36.9392 2002-01-01 35.8639 2003-01-01 33.1159 2004-01-01 31.0940 2005-01-01 28.1507 2006-01-01 27.2690 2007-01-01 29.4529 2008-01-01 26.6797 2009-01-01 37.0657 2010-01-01 33.0990 2011-01-01 32.8428 2012-01-01 33.2330 2013-01-01 35.5271 2014-01-01 40.2143 2015-01-01 40.8106 2016-01-01 38.6816 2017-01-01 33.3808 2018-01-01 36.4403 2019-01-01 35.5110