Year	US Dollars
1960	0.11717
1961	5.35948
1962	7.77945
1963	0.40701
1964	0.68025
1965	0.7429
1966	0.7105
1967	0.5951
1968	0.24437
1969	0.23435
1970	0.07499
1971	0.36058
1972	0.139
1973	0.80502
1974	0.97204
1975	0.8769
1976	0.66641
1977	0.46904
1978	0.56761
1979	0.49464
1980	0.15964
1981	0.97888
1982	1.34576
1983	2.12025
1984	3.77302
1985	6.30293
1986	11.05237
1987	13.62994
1988	18.39425
1989	17.96542
1990	14.81323
1991	13.41436
1992	19.35721
1993	17.80741
1994	18.01771
1995	14.34317