Year	US Dollars
1960	-0.1397
1961	0.00587
1962	0.58279
1963	0.3454
1964	0.24435
1965	1.20833
1966	1.22002
1967	3.73685
1968	2.29125
1969	7.49082
1970	13.81051
1971	14.63392
1972	13.84501
1973	11.50479
1974	9.34164
1975	5.17546
1976	4.80094
1977	5.29394
1978	2.81696
1979	2.31592
1980	5.75407
1981	8.63854
1982	7.77641
1983	5.41577
1984	14.76455
1985	8.56373
1986	10.78887
1987	8.4547
1988	7.76148
1989	32.42348
1990	-0.57103
1991	2.4784
1992	6.17204
1993	7.13451
1994	4.9312
1995	4.7269