Year	US Dollars adjusted for inflation)
1970	977
1971	1077
1972	1093
1973	1042
1974	1117
1975	1200
1976	1209
1977	1593
1978	1617
1979	1933
1980	1806
1981	1428
1982	1438
1983	1319
1984	1215
1985	1315
1986	1263
1987	1271
1988	1429
1989	1486
1990	1475
1991	1437
1992	1342
1993	1299
1994	1299
1995	1270
1996	1229
1997	1316
1998	1297
1999	1243
2000	1300
2001	1355
2002	1353
2003	1384
2004	1324