Year	% of GDP
1967	12.705691822285
1968	12.3375260914302
1969	12.940701602144
1970	11.4198789479071
1971	12.0823163411277
1972	13.6536976858404
1973	16.9873893344417
1974	22.5289477065507
1975	17.4901931183924
1976	17.6935353203424
1977	20.8100727170931
1978	17.7814258258226
1979	20.4442110541974
1980	23.9673176099303
1981	14.1464403830385
1982	12.601175385231
1983	12.6453066596514
1984	13.1124359825443
1985	13.0720137719314
1986	12.1516704485367
1987	15.4099138280763
1988	14.8129825959368
1989	21.5403520873892
1990	20.3866542570263
1991	22.6968419083712
1992	22.5383168154324
1993	21.5462106532553
1994	18.9797965985152
1995	24.2534164973424
1996	23.2635601795274
1997	25.6127215812624
1998	20.7994560258845
1999	21.5150991821174
2000	27.9316960619992
2001	25.3364614158761
2002	23.5874190360258
2003	25.9650236135947
2004	23.8150990653494
2005	23.4733313319434
2006	26.146886183176
2007	22.5242496375225
2008	24.1584542816736
2009	19.7837319120666
2010	23.2061620905984
2011	26.3874966239355
2012	25.267141113925
2013	19.4326070383606
2014	18.6248880197275
2015	14.1707020673663
2016	12.6663633909704
2017	14.8290456864411