Year	US Dollars
1966	183.95723
1967	120.31088
1968	158.89448
1969	158.65385
1970	204.19644
1971	318.58333
1972	437.92828
1973	580.85603
1974	473.66412
1975	488.37735
1976	346.94031
1977	573.97057
1978	836.43638
1979	1073.28515
1980	1413.56659
1981	1052.71643
1982	1088.94992
1983	1223.26828
1984	860.60003
1985	941.21072
1986	1312.93293
1987	1760.93461
1988	1595.47819
1989	1687.25812
1990	1769.52471
1991	1771.64946
1992	1991.00112
1993	2139.50444
1994	2155.50814
1995	2328.03273
1996	2005.12246
1997	1682.17343
1998	1648.43951
1999	1503.29333