Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 25 | Metric tons | NA |
| 2004 | 39 | Metric tons | 56.00 % |
| 2005 | 3 | Metric tons | -92.31 % |
| 2006 | 6 | Metric tons | 100.00 % |
| 2007 | 35 | Metric tons | 483.33 % |
| 2008 | 38 | Metric tons | 8.57 % |
| 2009 | 30 | Metric tons | -21.05 % |
