Year	US Dollars adjusted for inflation)
1970	9790
1971	8552
1972	8637
1973	7331
1974	7830
1975	9245
1976	11200
1977	11070
1978	10410
1979	10270
1980	9483
1981	10510
1982	11040
1983	11680
1984	12600
1985	13570
1986	13400
1987	12800
1988	13400
1989	13210
1990	13840
1991	14300
1992	14850
1993	15330
1994	15320
1995	15700
1996	16010
1997	16370
1998	16200
1999	15860
2000	16190
2001	17070
2002	16750
2003	16270