Year Percent of GDP 2004-01-01 23.1490736148418 2005-01-01 22.8900292762351 2006-01-01 22.0670161652371 2007-01-01 20.5214242174776 2008-01-01 18.7560307176755 2009-01-01 17.1127750880759 2010-01-01 18.4832355960905 2011-01-01 18.2281301934926 2012-01-01 16.6482406188948 2013-01-01 17.7557889108043 2014-01-01 17.4837445419611 2015-01-01 17.3257346535657 2016-01-01 18.2246779034338 2017-01-01 18.2468638274112 2018-01-01 17.6652643345081 2019-01-01 17.1074999477426