Year	US Dollars adjusted for inflation)
1970	1067
1971	1086
1972	1093
1973	1156
1974	1168
1975	1207
1976	1219
1977	1279
1978	1337
1979	1355
1980	1403
1981	1479
1982	1559
1983	1604
1984	1654
1985	1701
1986	1810
1987	1822
1988	1864
1989	1862
1990	1768
1991	1568
1992	1392
1993	1329
1994	1340
1995	1413
1996	1414
1997	1449
1998	1479
1999	1505
2000	1501
2001	1495
2002	1534
2003	1597