Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 276 | Metric tons | NA |
| 2004 | 168 | Metric tons | -39.13 % |
| 2005 | 120 | Metric tons | -28.57 % |
| 2006 | 240 | Metric tons | 100.00 % |
| 2007 | 200 | Metric tons | -16.67 % |
