Year Percent of GDP 2000-01-01 65.9352 2001-01-01 54.7068 2002-01-01 54.1509 2003-01-01 55.1277 2004-01-01 54.1011 2005-01-01 52.4220 2006-01-01 41.3421 2007-01-01 36.3503 2008-01-01 23.1235 2009-01-01 20.4776 2010-01-01 16.8191 2011-01-01 20.3527 2012-01-01 21.2324 2013-01-01 24.5957 2014-01-01 23.7981 2015-01-01 19.9192 2016-01-01 21.2875 2017-01-01 21.2689 2018-01-01 16.7848 2019-01-01 13.9939