Year	% of GDP
1965	26.8672304502468
1966	26.4914030512833
1967	28.6365844828747
1968	28.5517237039993
1969	28.3665758298384
1970	27.7426852279314
1971	30.4007783720118
1972	29.8157831000361
1973	30.8676182119739
1974	26.9370071581458
1975	30.6025877983281
1976	30.5162226541624
1977	32.996085266639
1978	34.571391520097
1979	32.9247845444007
1980	32.8138539438314
1981	26.0598380950885
1982	28.4752275439929
1983	34.5574896617048
1984	33.662718420482
1985	31.8321885476749
1986	32.7851518985737
1987	33.6396369779951
1988	34.6659106074516
1989	34.2295399159491
1990	33.9029195019895
1992	36.6221362051781
1993	36.7556047277641
1994	38.9852783874109
1995	36.9953521458118
1996	35.2350953107062
1997	36.3439796566405
1998	37.8423885968974
1999	37.3520847795999
2000	33.7381151278565
2001	37.0965298495892
2002	33.0805878889236
2003	36.6503926783391
2004	35.1298979080746
2005	33.2168352170005
2006	30.8697634547488
2007	33.4609558419384
2008	32.76132900354
2009	38.0781804311472
2010	37.6893422146381
2011	36.1425866890034
2012	35.2375290856027
2013	33.1703131534045
2014	33.2332483987569
2015	35.4464658248347
2016	37.7789061981281
2017	38.6841403354288
2018	39.6077104000616