Year	US Dollars adjusted for inflation)
1970	5168
1971	4979
1972	5249
1973	5022
1974	5170
1975	4871
1976	4414
1977	4717
1978	4738
1979	5263
1980	5383
1981	5281
1982	5618
1983	7076
1984	7171
1985	7499
1986	7878
1987	7852
1988	9697
1989	9985
1990	10790
1991	10710
1992	11150
1993	12000
1994	12620
1995	12020
1996	12440
1997	12950
1998	13670
1999	14060
2000	14060
2001	14320
2002	15270
2003	15820