Year	% of GDP
1962	3.00883849608737
1963	3.27876083512636
1964	3.55727698133038
1965	4.61156245564988
1966	6.39855326299675
1967	9.07564079937563
1968	10.5581381167863
1969	10.4668071657411
1970	4.67849427583826
1971	3.88208194014446
1972	3.91397491677759
1973	4.3491245686551
1974	5.59604220882408
1975	7.59027905561948
1976	6.38251014179191
1977	5.1253603607871
1978	10.5800259568082
1979	12.9073809165731
1980	15.880000398451
1981	17.3403960365268
1982	19.7665161262582
1983	19.9291223317583
1984	20.485669152971
1985	19.7568299807257
1986	20.2914912717392
1987	17.8225303268282
1988	17.6591423113432
1989	16.4484251946374
1990	16.1735566193514
1991	14.9268743372846
1992	15.1070971788138
1993	12.3818219539467
1994	11.24194033902
1995	8.65369631208646
1996	8.78388062547898
1997	10.2166129811111
1998	9.23017572030057
1999	9.38701075371423
2000	9.18747266479225
2001	12.2121949509116
2002	9.75007932310947
2003	10.7114834645669
2004	11.988100296317
2005	10.3141066337064
2006	5.98817049854261
2007	8.37807737462003
2008	7.44890256326698
2009	13.8883095754094
2010	14.1531642023173
2011	15.8295474838449
2012	14.5493477900723
2013	13.5985864144404
2014	14.6787244014211
2015	18.6494379815483
2016	20.372967461156
2017	21.4277359681704
2018	21.9762168961913