Year Percent of GDP 2000-01-01 25.2204 2001-01-01 25.1615 2002-01-01 25.3050 2003-01-01 24.6216 2004-01-01 24.1469 2005-01-01 24.1661 2006-01-01 23.9707 2007-01-01 24.4634 2008-01-01 24.8311 2009-01-01 25.7496 2010-01-01 25.1729 2011-01-01 29.2947 2012-01-01 29.7760 2013-01-01 32.4224 2014-01-01 29.8088 2015-01-01 28.8170 2016-01-01 28.6912 2017-01-01 30.1556 2018-01-01 30.1390 2019-01-01 29.3219