Year	US Dollars adjusted for inflation)
1970	1768
1971	1818
1972	1769
1973	1794
1974	1845
1975	1871
1976	2107
1977	2141
1978	2272
1979	2339
1980	2612
1981	2557
1982	2329
1983	2278
1984	2283
1985	2265
1986	2199
1987	2120
1988	2160
1989	1945
1990	1950
1991	1905
1992	1781
1993	1898
1994	1712
1995	1912
1996	1873
1997	1882
1998	1931
1999	1934
2000	2069