Year	US Dollars adjusted for inflation)
1970	1277
1971	1262
1972	1243
1973	1229
1974	1322
1975	1376
1976	1494
1977	1510
1978	1382
1979	1392
1980	1272
1981	1321
1982	1159
1983	1162
1984	1160
1985	1159
1986	1212
1987	1204
1988	1210
1989	1247
1990	1237
1991	1246
1992	1192
1993	1323
1994	1335
1995	1385
1996	1398
1997	1429
1998	1424
1999	1486
2000	1521
2001	1509
2002	1502
2003	1429