Year Percent of GDP 2000-01-01 29.9555 2001-01-01 27.0028 2002-01-01 28.9335 2003-01-01 27.7473 2004-01-01 28.2196 2005-01-01 29.2054 2006-01-01 30.0273 2007-01-01 32.2216 2008-01-01 30.2463 2009-01-01 39.3597 2010-01-01 37.6405 2011-01-01 37.4088 2012-01-01 40.2448 2013-01-01 38.0435 2014-01-01 39.3137 2015-01-01 38.7096 2016-01-01 41.6718 2017-01-01 43.0654 2018-01-01 39.1743 2019-01-01 38.9011