Year Percent of GDP 2004-01-01 17.5169907263144 2005-01-01 18.2150615923655 2006-01-01 18.6335884065262 2007-01-01 20.4569755362367 2008-01-01 19.6127114227698 2009-01-01 19.3326228276265 2010-01-01 20.7348970640529 2011-01-01 21.7027612204843 2012-01-01 21.4756052630961 2013-01-01 20.1055702233552 2014-01-01 22.4316792978254 2015-01-01 18.0889270163348 2016-01-01 16.1993253543220 2017-01-01 16.7427369254951 2018-01-01 16.8173103487335 2019-01-01 18.5389689715531