Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 229 | Metric tons | NA |
| 2004 | 31 | Metric tons | -86.46 % |
| 2005 | 91 | Metric tons | 193.55 % |
| 2006 | 375 | Metric tons | 312.09 % |
| 2007 | 77 | Metric tons | -79.47 % |
