Year Percent of GDP 2004-01-01 47.5479 2005-01-01 47.7720 2006-01-01 47.4460 2007-01-01 46.7460 2008-01-01 46.4126 2009-01-01 50.5871 2010-01-01 52.3693 2011-01-01 51.9621 2012-01-01 52.3714 2013-01-01 51.8277 2014-01-01 52.6942 2015-01-01 53.3964 2016-01-01 55.2414 2017-01-01 58.8120