Year	US Dollars
1960	10.19108
1961	53.26569
1962	49.35459
1963	20.20457
1964	25.1604
1966	51.60339
1967	1937.14761
1974	165.58249
1975	235.36278
1976	248.36977
1977	193.79845
1978	109.07057
1979	158.14638
1980	414.97886
1981	332.98465
1982	319.62318
1983	250.91351
1984	144.27978
1985	154.52204
1986	104.71587
1987	148.75681
1988	133.62571
1989	382.34709
1990	356.66262
1991	374.14543
1992	330.17723
1993	196.38089
1994	636.33727
1995	80.90981
1996	66.77704
1997	100.58631
1998	61.32397
1999	130.7056