Year Percent of GDP 2004-01-01 13.4804984066257 2005-01-01 12.6700805797847 2006-01-01 12.9062072337244 2007-01-01 13.5659106590379 2008-01-01 12.9092289097108 2009-01-01 13.6417301300923 2010-01-01 15.3180148363534 2011-01-01 15.6831186881981 2012-01-01 17.5246999570920 2013-01-01 18.9245612624085 2014-01-01 17.3972835889590 2015-01-01 17.0045383111278 2016-01-01 18.3543125188026 2017-01-01 19.0264484648948 2018-01-01 19.6683033972403 2019-01-01 20.4665958050796