Year Percent of GDP 2000-01-01 18.5879 2001-01-01 20.4989 2002-01-01 22.3445 2003-01-01 22.1625 2004-01-01 22.5588 2005-01-01 24.2556 2006-01-01 26.2542 2007-01-01 28.5928 2008-01-01 27.9360 2009-01-01 27.6581 2010-01-01 28.3570 2011-01-01 29.6467 2012-01-01 32.1812 2013-01-01 32.0192 2014-01-01 33.0400 2015-01-01 33.4667 2016-01-01 32.4851 2017-01-01 33.7705 2018-01-01 31.6117 2019-01-01 31.5195