Year Percent of GDP 2000-01-01 15.8562 2001-01-01 15.4744 2002-01-01 15.3611 2003-01-01 14.5628 2004-01-01 14.8768 2005-01-01 17.3815 2006-01-01 17.5107 2007-01-01 19.3405 2008-01-01 20.0561 2009-01-01 20.1926 2010-01-01 20.4057 2011-01-01 20.5565 2012-01-01 20.5248 2013-01-01 21.9660 2014-01-01 21.7473 2015-01-01 20.9433 2016-01-01 20.8048 2017-01-01 20.9636 2018-01-01 21.2148 2019-01-01 22.8048