Year Percent of GDP 2000-01-01 15.1840 2001-01-01 15.8484 2002-01-01 15.9390 2003-01-01 15.4062 2004-01-01 21.8053 2005-01-01 23.5201 2006-01-01 25.4508 2007-01-01 28.6578 2008-01-01 27.4555 2009-01-01 27.1094 2010-01-01 26.0021 2011-01-01 27.3178 2012-01-01 27.7534 2013-01-01 26.7363 2014-01-01 27.0478 2015-01-01 27.0966 2016-01-01 27.5378 2017-01-01 28.2866 2018-01-01 27.2605 2019-01-01 27.0044