Year	US Dollars
1960	3.07286
1961	3.83022
1962	2.88829
1963	2.48398
1964	3.50867
1965	0.11508
1966	7.12294
1967	8.20255
1968	5.29071
1969	3.43519
1970	17.74668
1971	16.28386
1972	11.92758
1973	1.72122
1974	1.1993
1975	7.45316
1976	1.69332
1977	49.31663
1978	2.09878
1979	7.73844
1980	4.02348
1981	0.29995
1982	4.01591
1983	3.48263
1984	2.53758
1985	2.93577
1986	23.27233
1987	72.7707
1988	-7.10942
1989	-3.30945
1990	1.86301
1991	-3.81401
1992	-4.5978
1993	-4.57431
1994	-3.4478
1995	2.22269