Year	% of GDP
2008	18.3494320395115
2009	16.9333041532624
2010	33.1545986311909
2011	37.5995095680529
2012	33.5831339945811
2013	32.456213802314
2014	30.5605456602098
2015	31.3334204840025
2016	30.9383540538056
2017	29.182559454284