Year Percent of GDP 2004-01-01 21.7588352543066 2005-01-01 21.6346117681248 2006-01-01 22.0714465170273 2007-01-01 21.4897126277645 2008-01-01 18.9681825364654 2009-01-01 22.8357517537249 2010-01-01 20.2611995913755 2011-01-01 20.5617367243454 2012-01-01 15.5310939556322 2013-01-01 19.7489465068772 2014-01-01 20.0183290517572 2015-01-01 20.9386885123179 2016-01-01 22.2723547508999 2017-01-01 22.9096002478048 2018-01-01 23.5841259954057 2019-01-01 22.9952898872080