Year	% of GDP
1960	1.78495841897658
1961	3.30938915069416
1962	5.62919981723066
1963	7.16316691441883
1964	8.50649474907996
1965	8.6818712614094
1966	10.0488148115572
1967	13.2163805628801
1968	16.7052489905787
1969	17.3567147801131
1970	12.7411705629638
1971	10.8622318175685
1972	11.5444914678242
1973	10.2925332201508
1974	-1.60171393593144
1975	4.43705492168365
1976	10.2770224455986
1977	17.7055232990919
1978	21.5835020664022
1979	20.2586689038031
1980	21.3485179603173
1981	11.3277891626318
1982	14.4424853945627
1983	17.453712407915
1984	18.3719194949806
1985	16.99403552878
1986	18.402291048249
1987	16.4749732782022
1988	16.0802393689223
1989	11.0930204371767
1990	12.4665062180024
1991	11.9663647031268
1992	18.8814092474715
1993	22.3244657644985
1994	24.8256392614291
1995	15.3008193693876
1996	9.08157459100074
1997	8.2800346105183
1998	10.665426250462
1999	11.528078147967
2000	6.68311458795659
2001	11.5078174532576
2002	12.11587279546
2003	13.6694960296905
2004	7.53679010759509
2005	5.48094928693031
2006	3.02397990336109
2007	11.5948402521336
2008	16.392730798656
2009	21.5452857273429
2010	19.0926881893613
2011	22.3524896227026
2012	20.8742210501408
2013	21.8524997858131
2014	21.6457456888416
2015	23.1437027956909
2016	26.5551302713839
2017	23.3338792942712
2018	21.2033901845536