Year	US Dollars
1960	37.75838
1961	30.03843
1962	27.29237
1963	53.44908
1964	61.01167
1965	51.88206
1966	55.32995
1967	51.7413
1968	54.72556
1969	49.45777
1970	64.62911
1971	52.98976
1972	49.72723
1973	90.96625
1974	71.29234
1975	110.61002
1976	99.1582
1977	101.54087
1978	127.4413
1979	165.31457
1980	50.30871
1981	154.77362
1982	76.95659
1983	133.21271
1984	34.51374
1985	54.48028
1986	19.9637
1987	-4.15112
1988	-8.14799
1989	-14.85507
1990	14.9928
1991	59.91562
1992	12.5946
1993	83.13853
1994	113.36804
1995	24.40259
1996	189.96854
1997	58.49145
1998	56.76288
1999	64.76116
2000	54.44939
2001	4.32539
2002	27.88097