Year	% of GDP
1965	26.8672304502468
1966	26.4914030512833
1967	28.6365844828746
1968	28.5517237039993
1969	28.3665758298385
1970	27.7426852279314
1971	30.3962718889052
1972	29.8122456042758
1973	30.8653388442319
1974	26.9353573514628
1975	30.5986413898539
1976	30.5135795062117
1977	32.9914184648802
1978	34.5654693630029
1979	32.9170135635187
1980	32.8062696134615
1981	26.059051982208
1982	28.4751012073649
1983	34.5556820439532
1984	33.6616131008589
1985	31.8336525792471
1986	32.7877849578262
1987	33.641108302755
1988	34.6718099981735
1989	34.239816199961
1990	33.912820372518
1992	36.6356842512143
1993	36.7811267295748
1994	39.0253792816585
1995	37.0465211011342
1996	35.2970458640573
1997	36.4101098670225
1998	37.9356670590684
1999	37.4673709451751
2000	33.8584484653153
2001	37.2307659940263
2002	33.245879245992
2003	36.7878607404154
2004	35.229728791501
2005	33.302154247071
2006	30.9321107955378
2007	33.5036744500128
2008	32.788377141651
2009	38.0820062619265
2010	37.6980846678584
2011	36.1480437540664
2012	35.2384031014349
2013	33.1738122515404
2014	33.2347096062829
2015	35.4466171382986
2016	37.7812620919956
2017	38.6891860740233
2018	39.6093107076551