Year	US Dollars adjusted for inflation)
1970	1042
1971	1045
1972	1056
1973	979.4
1974	1069
1975	1099
1976	1175
1977	1201
1978	1158
1979	1151
1980	1240
1981	1759
1982	2037
1983	1995
1984	2488
1985	2630
1986	2796
1987	2876
1988	2781
1989	2891
1990	3096
1991	3370
1992	3155
1993	3079
1994	3116
1995	3234
1996	3184
1997	3250
1998	3254
1999	3275
2000	3398
2001	3431
2002	3468
2003	3197