Year	% of GDP
1970	13.2603813673659
1971	18.7428176995289
1972	22.6790583643974
1973	25.1042669694965
1974	29.3812009101622
1975	36.9827671517477
1976	42.8136933874922
1977	39.4833425682116
1978	36.9688008168598
1979	36.3503657708394
1980	33.0253906335729
1981	32.8796020742002
1982	34.9421680464634
1983	38.0037126577072
1984	38.3406963761827
1985	38.3291788319478
1986	43.3785170279448
1987	34.3410558967306
1988	31.0591780967466
1989	29.2026291109355
1990	26.2453142386803
1991	31.0145376655118
1992	33.2998660817627
1993	36.8148369775149
1994	38.4402727015962
1995	37.8992052283149
1996	36.5960610954508
1997	39.5763886005707
1998	44.0355640323323
1999	46.0132820650577
2000	40.5117896497586
2001	41.8156768047881
2002	44.5383071446789
2003	42.1254859958743
2004	43.9429196313401
2005	43.6843509050045
2006	44.8777557241595
2007	53.1180542636418
2008	64.2133791234367
2009	71.4372673126356
2010	67.6972628796083
2011	69.5526802218115
2012	69.143571815315
2013	69.6306612918518
2014	63.8787679886058
2015	73.7175433979418