Year	current US$
1964	0.2044989729342041
1965	0.9980040068873873
1966	1.1764705619391274
1967	1.1538461280556827
1968	0.7547169642628359
1969	0.1851851810459737
1970	0.18181817775422873
1972	0.18450184089451255
1974	0.5617977402518296
1975	0.37735848213141887
1976	0.5639097618317237
1977	1.4981273073382153
1978	2.985074560144049
1979	2.788104200008625
1980	5.121638946261076
1981	3.814713777356748
1982	1.2624213294743494
1983	1.2515644608979652
1984	1.4178614786853003
1985	16.52079155006879
1986	1.568436157266716
1987	3.9758682807364862
1988	0.6855536549596432
1989	1.699495275235227
1990	711.155288182399
1991	-79.97153200033294
1992	-85.3315129277242
1993	-81.8197279182037
1994	-210.3843483182114
1995	-34.81404485163944
1996	-67.68780740842821