| Year | Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | |
| Dollars Per Ton | ||||||||
| 1963 | 49.00 | 49.00 | 49.00 | --- | --- | --- | --- | |
| 1968 | 59.00 | 58.00 | 58.00 | --- | --- | --- | --- | |
| 1973 | 50.00 | 49.00 | 50.00 | --- | --- | --- | --- | |
| 1978 | 79.00 | --- | --- | --- | --- | --- | --- | |
| 1983 | 65.00 | 65.00 | --- | --- | --- | --- | --- | |
| 1988 | 80.00 | --- | --- | --- | --- | --- | --- | |
| 1989 | --- | --- | --- | --- | --- | --- | --- | |
| 1990 | --- | --- | --- | --- | --- | --- | --- | |
| 1991 | --- | --- | --- | --- | --- | --- | --- | |
| 1992 | 55.00 | --- | --- | --- | --- | --- | --- | |
| 1993 | --- | --- | --- | --- | --- | --- | --- | |
| 1994 | --- | --- | --- | --- | --- | --- | --- | |
| 1995 | --- | --- | --- | --- | --- | --- | --- | |
| 1996 | --- | --- | --- | --- | --- | --- | --- | |
| 1997 | --- | --- | --- | --- | --- | --- | --- | |
| 1998 | 2 | --- | ||||||
| Year | Aug. | Sep. | Oct. | Nov. | Dec. |
Market Year Average 1 |
|||||
| Dollars Per Ton | |||||||||||
| 1963 | 47.00 | 52.00 | 56.00 | 57.00 | 55.00 | 54.50 | |||||
| 1968 | 56.00 | 51.00 | 52.00 | 52.00 | 52.00 | 51.90 | |||||
| 1973 | --- | 90.00 | 105.00 | 100.00 | 102.00 | 103.00 | |||||
| 1978 | --- | 123.00 | 122.00 | 124.00 | 124.00 | 123.00 | |||||
| 1983 | --- | --- | 165.00 | 165.00 | 165.00 | 165.00 | |||||
| 1988 | --- | 103.00 | 105.00 | 103.00 | 111.00 | 104.00 | |||||
| 1989 | --- | --- | 99.00 | 100.00 | 95.00 | 99.00 | |||||
| 1990 | --- | 110.00 | 110.00 | 110.00 | 110.00 | 110.00 | |||||
| 1991 | --- | 65.00 | 61.00 | 55.00 | 55.00 | 60.00 | |||||
| 1992 | 80.00 | 80.00 | 81.00 | 90.00 | 90.00 | 82.00 | |||||
| 1993 | --- | --- | 95.00 | 100.00 | 100.00 | 95.50 | |||||
| 1994 | --- | 90.00 | 95.00 | 95.00 | 95.00 | 93.00 | |||||
| 1995 | --- | 100.00 | 105.00 | 104.00 | 104.00 | 103.00 | |||||
| 1996 | --- | 124.00 | 120.00 | 106.00 | 102.00 | 119.00 | |||||
| 1997 | --- | --- | 100.00 | 112.00 | 110.00 | 106.00 | |||||