Year Percent of GDP 2000-01-01 17.2497 2001-01-01 16.1404 2002-01-01 18.0501 2003-01-01 16.0989 2004-01-01 15.1817 2005-01-01 15.9384 2006-01-01 17.0617 2007-01-01 19.4810 2008-01-01 21.8365 2009-01-01 19.2747 2010-01-01 20.3371 2011-01-01 19.3493 2012-01-01 21.6557 2013-01-01 21.8211 2014-01-01 20.0953 2015-01-01 19.7712 2016-01-01 19.9166 2017-01-01 21.3436 2018-01-01 21.1521 2019-01-01 21.4513