Year	US Dollars adjusted for inflation)
1970	64640
1971	64340
1972	63450
1973	54960
1974	45990
1975	38650
1976	39620
1977	37460
1978	36600
1979	39800
1980	29580
1981	25130
1982	23300
1983	21290
1984	20710
1985	19950
1986	19710
1987	19880
1988	19590
1989	22450
1990	16420
1991	21860
1992	25300
1993	31000
1994	30140
1995	30570
1996	30510
1997	28780
1998	28030
1999	25350
2000	25140
2001	24520
2002	23140
2003	26100