Year	% of GDP
1981	51.6660896326662
1982	50.150973896932
1983	44.9464124986459
1984	36.7334055605997
1985	30.8617032065502
1986	35.5281708368642
1987	33.1371227271263
1988	29.8164373031522
1989	33.8468832804308
1990	34.08478511071
1991	31.9863931865244
1992	30.8504542522965
1993	29.5707627814212
1994	28.9822963624148
1995	26.8558468880317
1996	26.1622273571594
1997	26.7273968067439
1998	27.3311028340391
1999	25.5239017101571
2000	24.4090926005147
2001	23.2387394469487
2002	21.1316314919463
2003	21.7432729775835
2004	20.6241163180701
2005	21.0361052011316
2006	21.8868155124099
2007	19.5382073789955
2008	19.3425168402828
2009	19.7876612832732
2010	17.541024571698
2011	16.656595479874
2012	16.2484119523522
2013	16.1896555695627
2014	16.5998505990279
2015	16.5818498091778
2016	15.9799602623477
2017	16.2566040366434