Year	US Dollars adjusted for inflation)
1970	2675
1971	2812
1972	2868
1973	2896
1974	2867
1975	3132
1976	3277
1977	3658
1978	3900
1979	3967
1980	3749
1981	4471
1982	5017
1983	5234
1984	5345
1985	6941
1986	7086
1987	7134
1988	7240
1989	7227
1990	6726
1991	6589
1992	5748
1993	4948
1994	5008
1995	4979
1996	5165
1997	5093
1998	5164
1999	5475
2000	5699
2001	5892
2002	6031
2003	6288