Year	US Dollars adjusted for inflation)
1970	5241
1971	5034
1972	4911
1973	4783
1974	4837
1975	5034
1976	4939
1977	5310
1978	5269
1979	5207
1980	4973
1981	5366
1982	5452
1983	5236
1984	5122
1985	4862
1986	5034
1987	5565
1988	5222
1989	4959
1990	4467
1991	4931
1992	4982
1993	4876
1994	4894
1995	4899
1996	4869
1997	4843
1998	4805
1999	4917
2000	5269
2001	5108
2002	5298
2003	5557