Year Percent of GDP 2004-01-01 21.5922018008660 2005-01-01 18.6355759184321 2006-01-01 19.5130758503112 2007-01-01 19.7324394954127 2008-01-01 21.9681922604939 2009-01-01 25.8668874848480 2010-01-01 27.2481596182275 2011-01-01 27.3634778611136 2012-01-01 28.3308604990361 2013-01-01 30.3372587029145 2014-01-01 31.9891043676856 2015-01-01 37.8883307576204 2016-01-01 38.9261269686641 2017-01-01 43.4718865671855 2018-01-01 45.8591773691400 2019-01-01 48.2042588267833