Year Percent of GDP 2004-01-01 26.1249 2005-01-01 35.0406 2006-01-01 47.3410 2007-01-01 58.3541 2008-01-01 49.0389 2009-01-01 48.8433 2010-01-01 41.5000 2011-01-01 37.0000 2012-01-01 37.5493 2013-01-01 36.1860 2014-01-01 34.7439 2015-01-01 33.4090 2016-01-01 30.0039 2017-01-01 30.0935