Year	current US$
1960	1.6186884154143417
1961	2.7011034057106538
1962	2.9587447927135853
1963	2.7679301407149537
1964	1.8906733534920785
1965	1.87521750055615
1966	2.202547402109313
1967	1.3642725827740794
1968	1.118550462337015
1969	1.1688206615464312
1970	0.8819633334021199
1971	1.2696552786833437
1972	1.6752842119001288
1973	1.2608293986647934
1974	0.6926154995232688
1975	0.5031569440700309
1976	0.9277088118912439
1977	0.5811841947868558
1978	0.748727447339589
1979	3.1357324788967387
1980	5.224570812245402
1981	3.9219144295843322
1982	3.4747082591287666
1983	1.918914090669104
1984	1.2838149734696829
1985	0.9907406371987778
1986	1.8378127273401181
1987	2.0918340736037657
1988	1.6505759418885397
1989	0.9764399587442942
1990	6.629859569804026
1991	10.67519516036355
1992	11.229244934975872
1993	17.590620469649682
1994	13.24124938889019
1995	14.601820593179392
1996	14.116479349269209
1997	11.755969770830845
1998	13.280582059606145
1999	21.433888008371742
2000	20.56652671873972
2001	19.64261972027615
2002	28.340353188306306
2003	20.472895725248016
2004	21.331098463199112
2005	21.829419412557144
2006	27.039260015229782
2007	23.704895642169507
2008	29.44835796789032
2009	31.512169879942267
2010	31.28500721468648
2011	45.22403554744782
2012	42.955775418511145
2013	38.33645250551381
2014	43.850492681864296
2015	35.79199355066111
2016	40.3875340197491
2017	40.28107085917867
2018	33.56523216273575
2019	29.51974167243319
2020	41.138483089676406
2021	40.497503373758974
2022	146.83056635995376