Year	US Dollars adjusted for inflation)
1970	3817
1971	3744
1972	4193
1973	4387
1974	4311
1975	4480
1976	4389
1977	4270
1978	4829
1979	4923
1980	4999
1981	5971
1982	5914
1983	5918
1984	6523
1985	7035
1986	7343
1987	7712
1988	7229
1989	7605
1990	8313
1991	9033
1992	9565
1993	9983
1994	11270
1995	11480
1996	12220
1997	13180
1998	13510
1999	14940
2000	14390
2001	14390
2002	14610
2003	14650