Year Percent of GDP 2000-01-01 27.9738 2001-01-01 29.1121 2002-01-01 27.9362 2003-01-01 26.0811 2004-01-01 26.4905 2005-01-01 30.9907 2006-01-01 28.1151 2007-01-01 28.6031 2008-01-01 30.5779 2009-01-01 30.4166 2010-01-01 31.0696 2011-01-01 33.7982 2012-01-01 35.2162 2013-01-01 32.9328 2014-01-01 32.8745 2015-01-01 30.7008 2016-01-01 30.1621 2017-01-01 29.6834 2018-01-01 29.5783 2019-01-01 28.8226