Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2005 | 86 | Thousand metric tons | NA |
| 2006 | 161 | Thousand metric tons | 87.21% |
| 2007 | 70 | Thousand metric tons | -56.52% |
