Year	US Dollars adjusted for inflation)
1970	1118
1971	980.4
1972	941.9
1973	962.2
1974	981.7
1975	991.4
1976	1021
1977	1089
1978	1219
1979	1153
1980	1071
1981	1061
1982	1062
1983	963.8
1984	1026
1985	1022
1986	1033
1987	989.7
1988	1011
1989	1020
1990	1006
1991	975.7
1992	786.8
1993	766
1994	781.2
1995	811
1996	770.7
1997	799.9
1998	823.2
1999	925.5
2000	945.1
2001	954.7
2002	917.8
2003	887.7