Year Percent of GDP 1995-01-01 21.447 1996-01-01 21.259 1997-01-01 20.448 1998-01-01 20.496 1999-01-01 21.688 2000-01-01 22.809 2001-01-01 24.384 2002-01-01 25.711 2003-01-01 26.574 2004-01-01 26.168 2005-01-01 26.098 2006-01-01 25.382 2007-01-01 29.036 2008-01-01 27.000 2009-01-01 34.346 2010-01-01 33.742 2011-01-01 33.638 2012-01-01 34.269 2013-01-01 36.997 2014-01-01 39.920 2015-01-01 41.066 2016-01-01 44.177 2017-01-01 46.960