Year	% of GDP
1967	39.02734594136951
1968	47.73772352983453
1969	48.32070513875388
1970	51.456513025584094
1971	54.7791393524932
1972	55.11221232103942
1973	49.33120425674622
1974	41.68187525428048
1975	35.78630057184915
1976	37.3517225998261
1977	41.222430122464424
1978	46.50575492078254
1979	53.81914149284101
1980	43.83369108643173
1981	41.48255137311468
1982	41.30612609348569
1983	37.973818710488736
1984	37.911563531210774
1985	38.438311332354495
1986	38.764646247592275
1987	39.10020902585297
1988	40.76808102161796
1989	42.54574486795092
1990	39.50149280976205
1991	37.76569260327641
1992	39.05900807873347
1993	42.39013293425992
1994	46.7790033344224
1995	47.13136003254302
1996	52.039576598294715
1997	47.14860342314197
1998	44.22379891873045
1999	44.31056145598373
2000	47.94953464724681
2001	44.93924927224898
2002	45.17596879453285
2003	48.881924101640664
2004	44.32875218710986
2005	46.51785511039927
2006	45.2428060336709
2007	43.462468206393886
2008	45.53574354071522
2009	45.725531663617026
2010	44.15444988940802
2011	39.02089553104785
2012	38.888552677246565
2013	46.95113511982948
2014	43.82978344273928
2015	44.97350394782643
2016	43.83775368230888
2017	44.192583475653976