Year	US Dollars adjusted for inflation)
1970	2095
1971	2248
1972	2594
1973	2682
1974	2588
1975	2561
1976	3985
1977	3680
1978	3837
1979	3805
1980	3616
1981	3548
1982	3381
1983	3464
1984	3394
1985	3625
1986	3694
1987	3677
1988	3513
1989	3513
1990	3248
1991	3417
1992	3543
1993	4469
1994	4544
1995	4251
1996	4292
1997	4148
1998	4331
1999	4784
2000	4355
2001	4433
2002	4445
2003	4492