Year	US Dollars adjusted for inflation)
1970	1326
1971	1340
1972	1306
1973	1318
1974	1362
1975	1371
1976	1310
1977	1302
1978	1291
1979	1335
1980	1343
1981	1357
1982	1397
1983	1340
1984	1326
1985	1407
1986	1328
1987	1372
1988	1256
1989	1197
1990	1178
1991	1074
1992	941.5
1993	909.4
1994	905.6
1995	946.2
1996	961.9
1997	801.7
1998	721.6
1999	663.1
2000	683.7
2001	666.5
2002	689.5
2003	712.8