Year Percent of GDP 2000-01-01 3.0927 2001-01-01 2.6897 2002-01-01 3.5946 2003-01-01 4.4037 2004-01-01 5.6401 2005-01-01 6.6315 2006-01-01 6.8415 2007-01-01 7.8525 2008-01-01 12.5322 2009-01-01 24.0836 2010-01-01 21.9421 2011-01-01 17.4326 2012-01-01 16.9757 2013-01-01 15.7462 2014-01-01 15.5371 2015-01-01 18.6998 2016-01-01 20.6980 2017-01-01 19.4709 2018-01-01 19.0440 2019-01-01 19.3472