Year	% of GDP
2008	82.5814051433421
2009	84.2123593348897
2010	67.3027016332341
2011	63.0371780054222
2012	63.360476331496
2013	66.2971623998265
2014	67.4157805806244
2015	68.2297805584709
2016	69.9794195217655
2017	71.2574298460291