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| TABLE 5 | ||||
| VALUE OF U.S. PHOSPHATE ROCK, BY GRADE� | ||||
| (Dollars per metric ton, free on board mine) | ||||
| Grade | ||||
| [percentage of bone phosphate of line (BPL) content1] | 2005 | 2006 | ||
| 66 to less than 70 | W | W | ||
| 60 to less than 66 | 29.67 | r | W | |
| Average weighted2 | 29.60 | r | 30.52 | |
| rRevised. W Withheld to avoid disclosing company proprietary data.�� | ||||
| 11.0% BPL (tricalcium phosphate)=0.458% P2O5. | ||||
| 2Includes less than 60% and greater than 70%, in addition to the grades listed. | ||||
Source: United States Geological Survey Mineral Resources Program