Year	% of GDP
1966	9.407836489012
1967	9.87233803327873
1968	10.233037943355
1969	9.71709059662561
1970	10.4110855462382
1971	12.7489538010399
1972	14.5739711493312
1973	15.3519207725899
1974	16.634021959288
1975	17.2930689534044
1976	20.8613815811448
1977	22.0926132341699
1978	23.0020687368135
1979	22.8804529865933
1980	23.3296121496615
1981	24.7574397435556
1982	25.7138437982514
1983	26.3069315063341
1984	26.0839108368577
1985	25.2975514198903
1986	24.0227143236959
1987	23.7944644706551
1988	23.4727924627484
1989	24.4906099510847
1990	26.1346954037524
1991	23.8781042907137
1992	20.8424677689317
1993	20.8839751202098
1994	19.8607061308022
1995	20.9639283602055
1996	19.0222713480997
1997	19.2985730122578
1998	20.3642496390339
1999	20.933456188834
2000	19.2863181349466
2001	23.472880943952
2002	22.8822605665934
2003	22.4435996538536
2004	22.1793802825244
2005	21.658828775624
2006	19.8444406653977
2007	20.290149058062
2008	21.90064524712
2009	27.3489729499893
2010	27.2231536777504
2011	27.2431030248456
2012	26.615447095286
2013	27.9984065555372
2014	30.5539634606985
2015	34.2969419320781
2016	37.3488225210426
2017	38.7572427790254
2018	43.0229404289886