Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1470 | Metric tons | NA |
| 2004 | 6000 | Metric tons | 308.16% |
| 2005 | 1300 | Metric tons | -78.33% |
| 2006 | 1300 | Metric tons | 0.00% |
| 2007 | 1400 | Metric tons | 7.69% |
