Year	% of GDP
1967	39.9649412809217
1968	29.1813237605619
1969	35.0141783657102
1970	33.3580724959147
1971	33.6794511683676
1972	33.2568231929854
1973	38.0427255565209
1974	49.1745002634952
1975	47.1757883572853
1976	43.3584788791378
1977	38.9824125323885
1978	42.2877828673384
1979	38.639755737176
1980	37.1008276338594
1981	35.385925824566
1982	38.9999369040308
1983	39.0275480441287
1984	20.6781441716185
1985	20.3312551805216
1986	22.5177878129253
1987	21.7061223737107
1988	15.6062841804988
1989	15.6664909474004
1990	12.346467364312
1991	11.3899051153461
1992	11.9322362294568
1993	12.4944905010949
1994	10.3384956168932
1995	10.1326821996172
1996	9.67197062996508
1997	11.3082999283605
1998	13.2807578693215
1999	12.7263239849587
2000	11.7460702641293
2001	16.2534233500733
2002	17.1493103007419
2003	16.2585705538384
2004	18.7384992846546
2005	17.9146718324679
2006	15.6602283321835
2007	16.2234960401244
2008	11.253173585276
2009	12.7889380770942
2010	15.4814131205332
2011	18.0383416413548
2012	21.1139846679029
2013	21.6775971192392
2014	23.9854123694713
2015	27.0280111165035
2016	31.3366317756269
2017	32.1296404307969
2018	32.3039082492081