| Year | Price range ($/t) | Comments |
| 1995 | 675 - 1250 | Drought in China |
| 1996 | 840 - 1845 | Drought in China |
| 1997 | 860 - 1225 | Drought in China |
| 1998 | 830 - 990 |
|
| 1999 | 690 - 865 |
|
| 2000 | 630 - 705 |
|
| 2001 | >650 |
|
| 2002 | 500 - 1100 |
|