Year Percent of GDP 2004-01-01 12.2438 2005-01-01 7.0296 2006-01-01 12.4512 2007-01-01 14.3430 2008-01-01 14.3715 2009-01-01 13.9148 2010-01-01 15.4948 2011-01-01 16.7075 2012-01-01 16.4862 2013-01-01 17.5696 2014-01-01 19.0672 2015-01-01 20.4068 2016-01-01 19.3336 2017-01-01 21.6000