Year Percent of GDP 2004-01-01 58.0770575834184 2005-01-01 62.6261259694959 2006-01-01 70.4395073393498 2007-01-01 75.2065766707024 2008-01-01 74.9796761842129 2009-01-01 72.2648123741614 2010-01-01 68.0077866557206 2011-01-01 65.9293256527935 2012-01-01 66.9475820489070 2013-01-01 65.8916164500504 2014-01-01 65.6970181686358 2015-01-01 66.6196895365848 2016-01-01 64.9589141956190 2017-01-01 63.3687310096513