Year Percent of GDP 2004-01-01 55.7689596136214 2005-01-01 47.6500024019284 2006-01-01 19.8101290523694 2007-01-01 14.7496079132533 2008-01-01 11.6571005306753 2009-01-01 12.0356770868097 2010-01-01 14.7044831374177 2011-01-01 15.6900830079074 2012-01-01 15.4119458328656 2013-01-01 18.2119329615650 2014-01-01 21.5337917608396 2015-01-01 31.9814924210146 2016-01-01 32.5165159842822 2017-01-01 36.9314702006344 2018-01-01 36.8657142591278 2019-01-01 36.6231051067057