Year	US Dollars adjusted for inflation)
1970	5725
1971	5872
1972	6419
1973	6880
1974	7054
1975	7235
1976	7501
1977	7987
1978	7886
1979	8523
1980	8503
1981	8779
1982	9081
1983	9198
1984	9475
1985	9554
1986	9769
1987	10160
1988	10330
1989	10330
1990	10090
1991	9018
1992	9035
1993	9541
1994	9408
1995	9534
1996	9595
1997	10000
1998	10400
1999	10820
2000	11380
2001	11950
2002	12520
2003	13020
2004	13640