Year	% of GDP
1970	2.531590810544387
1971	2.7575369059808614
1972	3.2186732404724117
1973	4.733057602500629
1974	12.132062955468273
1975	11.271802675793383
1976	12.370890011164093
1977	12.412461994160847
1978	12.229810774826333
1979	16.300293639237026
1980	18.79296762647929
1981	13.880715801379587
1982	12.088395742462133
1983	11.136272906568054
1984	9.999588004028059
1985	9.959624894297336
1986	5.74242543383476
1987	7.54011903288869
1988	6.951775087214658
1989	7.430852019680682
1990	8.180088832585234
1991	4.754797841692434
1992	4.50105300049269
1993	4.354044121297464
1994	3.804664700670147
1995	3.8931752191723525
1996	4.115775464007878
1997	3.58229231890636
1998	2.5220186507993128
1999	3.4703883691935244
2000	5.3209986922940065
2001	4.615312924573341
2002	4.443299585981656
2003	4.614571958650487
2004	6.334312819987519
2005	7.553751120899207
2006	8.08747179445607
2007	8.112267752902884
2008	10.396780870783461
2009	5.4799639791416785
2010	7.1436365172552
2011	8.538544764941868
2012	6.493195524774325
2013	5.408064942117185
2014	4.572402268669692
2015	2.5187735538454965
2016	2.2849715067063183
2017	2.8279859305420763
2018	3.490589292287659
2019	2.923575626370535
2020	1.9890828727910335
2021	3.90688153060054