Year Percent of GDP 2000-01-01 32.1268 2001-01-01 26.3168 2002-01-01 20.0610 2003-01-01 22.3736 2004-01-01 24.1070 2005-01-01 31.7308 2006-01-01 35.7773 2007-01-01 34.7783 2008-01-01 39.5873 2009-01-01 28.8703 2010-01-01 32.7709 2011-01-01 36.4618 2012-01-01 38.1237 2013-01-01 38.6905 2014-01-01 35.0332 2015-01-01 29.0115 2016-01-01 29.8257 2017-01-01 30.2727 2018-01-01 29.5977 2019-01-01 29.2217