Year	US Dollars adjusted for inflation)
1970	3728
1971	3806
1972	3715
1973	3646
1974	3684
1975	4008
1976	4272
1977	4710
1978	5003
1979	5010
1980	4647
1981	5006
1982	4875
1983	4913
1984	4780
1985	5311
1986	4926
1987	4352
1988	4960
1989	4858
1990	4679
1991	4867
1992	4579
1993	3747
1994	3052
1995	2829
1996	3855
1997	4446
1998	4830
1999	6252
2000	4753
2001	6122
2002	5939
2003	7866