Year	US Dollars
1960	-0.34934
1963	0.15079
1964	0.43232
1965	0.48326
1966	0.33042
1967	4.36165
1968	0.3022
1969	0.40522
1970	0.44661
1971	1.35549
1972	6.44885
1973	2.47981
1974	2.62936
1975	3.26925
1976	2.86274
1977	2.23242
1978	3.62764
1979	4.05604
1980	6.34631
1981	6.09767
1982	5.68532
1983	3.76185
1984	41.63108
1985	2.84628
1986	6.53897
1987	2.50374
1988	5.45206
1989	14.76498
1990	11.6374
1991	9.9979
1992	10.03642
1993	4.02549
1994	3.4014
1995	14.65512