Year	US Dollars adjusted for inflation)
1970	1731
1971	1748
1972	2120
1973	2119
1974	2148
1975	2263
1976	2270
1977	2121
1978	2205
1979	2121
1980	2121
1981	2298
1982	2423
1983	2529
1984	2556
1985	2549
1986	2617
1987	2326
1988	2096
1989	1907
1990	1751
1991	1837
1992	1447
1993	1137
1994	1022
1995	920.7
1996	939.7
1997	1029
1998	1047
1999	880.6
2000	478.1
2001	418.2
2002	525.9
2003	588.1
2004	580.8