Year	current US$
1960	1.9229093951722347
1961	-0.04412398505911081
1962	-2.29897122719757
1963	-0.5474229407841499
1964	-0.08967431689079482
1965	0.07029634005906019
1966	0.06185682056465672
1967	0.07991041246642498
1968	0.08921271916442654
1969	0.23268375460300816
1970	0.23910160002315192
1971	0.2985934165342903
1972	0.331635008026681
1973	0.3851168313368139
1974	0.482394200672229
1975	0.3785987149342555
1976	0.2139537219762413
1977	0.7641156728598634
1978	0.6677115641742927
1979	1.108241822531776
1980	1.26134149751675
1981	2.3824215998407974
1982	4.137073747275316
1983	3.607179191920736
1984	2.851256634482214
1985	2.1318446268659983
1986	2.23831633410778
1987	1.51315155084723
1988	1.2716026567371121
1989	0.8864585703498815
1990	0.9159773154661585
1991	0.8280155776122001
1992	2.882298048086
1993	1.6288943614548677
1994	0.9103021001712642
1995	0.8994720946385587
1996	0.7253888106563172
1997	0.06921325618587862
1998	0.8103521955995728
1999	1.0542769192138426
2000	1.019148912442421
2001	0.5935905913976813
2002	0.7417094495523996
2003	0.5956585502834086
2004	0.8553868652436957
2005	1.0291977623065407
2006	0.9573385214934521
2007	-4.964760216686526