Year Percent of GDP 2000-01-01 18.1929 2001-01-01 17.4155 2002-01-01 19.1816 2003-01-01 19.0884 2004-01-01 20.3009 2005-01-01 22.9829 2006-01-01 21.6840 2007-01-01 28.1573 2008-01-01 27.6271 2009-01-01 28.8514 2010-01-01 26.1385 2011-01-01 27.0268 2012-01-01 24.5756 2013-01-01 27.7489 2014-01-01 28.4278 2015-01-01 31.8183 2016-01-01 39.6804 2017-01-01 31.5193 2018-01-01 35.3955 2019-01-01 33.5568