Year Percent of GDP 2000-01-01 18.2397 2001-01-01 16.7848 2002-01-01 23.1388 2003-01-01 21.6621 2004-01-01 24.2159 2005-01-01 22.4980 2006-01-01 25.2991 2007-01-01 26.0677 2008-01-01 31.4390 2009-01-01 34.5064 2010-01-01 31.9580 2011-01-01 33.7346 2012-01-01 36.6364 2013-01-01 37.7793 2014-01-01 36.3742 2015-01-01 38.6780 2016-01-01 35.4207 2017-01-01 36.0805 2018-01-01 36.5802 2019-01-01 37.7681