Year Percent of GDP 1996-01-01 29.5213677508970 1997-01-01 30.6949328876753 1998-01-01 31.5030034435746 1999-01-01 32.6955624423103 2000-01-01 36.6961927246343 2001-01-01 37.8019086565824 2002-01-01 36.4516156250333 2003-01-01 37.9326350651133 2004-01-01 39.4887337751464 2005-01-01 40.1883457970833 2006-01-01 40.9072105121170 2007-01-01 41.9082785948182 2008-01-01 42.3768394755641 2009-01-01 35.5826430481154 2010-01-01 40.2733922571636 2011-01-01 44.2490059124969 2012-01-01 43.6275801757428 2013-01-01 42.5433444029915 2014-01-01 41.1636268500564 2015-01-01 40.7762857043667 2016-01-01 39.9089358913570 2017-01-01 42.1079770169221