Year	current US$
1960	-0.13969873917172315
1961	0.005874060019080463
1962	0.5827905273263112
1963	0.3454039023779231
1964	0.24435273027751464
1965	1.2083311099633103
1966	1.2200164883663305
1967	3.7368526832957123
1968	2.2912525514485087
1969	7.4908201668224725
1970	13.81050997587875
1971	14.633915507735294
1972	13.845009866688581
1973	11.504787752957728
1974	9.341644956366535
1975	5.175461874899231
1976	4.800941973959709
1977	5.2939407472656
1978	2.8169612994735385
1979	2.3159219554967527
1980	5.754066618470098
1981	8.6385410659465
1982	7.7764082076649
1983	5.415766540844725
1984	14.764545090820947
1985	8.56373119357351
1986	10.788867736352923
1987	8.454696585748573
1988	7.761476427664692
1989	32.42347618677564
1990	-0.5710287606630563
1991	2.4784032770189848
1992	6.172041006017151
1993	7.13451223494891
1994	4.931197400665799
1995	4.726903528441177