Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 9 | Metric tons | NA |
| 2003 | 21 | Metric tons | 133.33 % |
| 2004 | 24 | Metric tons | 14.29 % |
| 2005 | 17 | Metric tons | -29.17 % |
| 2006 | 25 | Metric tons | 47.06 % |
| 2007 | 25 | Metric tons | 0.00 % |
| 2008 | 15 | Metric tons | -40.00 % |
| 2009 | 15 | Metric tons | 0.00 % |
