Year	current US$
1961	-0.4710079760013218
1962	-6.557550488044343
1963	-2.401936746929231
1964	-1.8894337608140623
1965	-2.4910477413003465
1966	-2.5465858194443496
1967	-2.3179373854640546
1968	0.014681765066035028
1969	0.4441190738543371
1970	0.435981686326787
1971	0.5938975171161931
1972	0.6456660743763095
1973	0.40184351975255195
1974	0.36877950986449093
1975	0.3010954519196404
1976	0.16256114020027018
1977	0.4089077676147102
1978	0.707259338167637
1979	0.8284557987550929
1980	6.861373479620047
1981	5.975743324350818
1982	3.5452390849377555
1983	2.9723022021603973
1984	2.464186487763219
1985	2.228721946106735
1986	2.5202061275290193
1987	1.6548880484887896
1988	2.7898418090294403
1989	2.1357339482580646
1990	7.67789593207462
1991	8.77939546762359
1992	4.029289919314459
1993	1.2275911525084102
1994	2.7237727424015574
1995	2.5555484515512057