Year	US Dollars
1966	131.4027
1967	142.83693
1968	165.88972
1969	162.47375
1970	167.69728
1971	161.08691
1972	217.38615
1973	384.69472
1974	278.24365
1975	513.04054
1976	537.9063
1977	558.56439
1978	589.61268
1979	907.65184
1980	974.74804
1981	868.48396
1982	993.55868
1983	993.0631
1984	939.35982
1985	916.8986
1986	1288.26826
1987	1495.91585
1988	1641.61789
1989	1397.19513
1990	1230.09727
1991	1445.71212
1992	1487.9725
1993	1490.6979
1994	1615.89411
1995	1948.31621
1996	1718.06508
1997	1536.9652
1998	1524.89684
1999	1424.10897