Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 7813 | Metric tons | NA |
| 2004 | 3045 | Metric tons | -61.03% |
| 2005 | 3500 | Metric tons | 14.94% |
| 2006 | 3500 | Metric tons | 0.00% |
| 2007 | 3500 | Metric tons | 0.00% |
| 2008 | 3500 | Metric tons | 0.00% |
