Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 80 | Metric tons | NA |
| 2004 | 65 | Metric tons | -18.75 % |
| 2005 | 160 | Metric tons | 146.15 % |
| 2006 | 190 | Metric tons | 18.75 % |
| 2007 | 200 | Metric tons | 5.26 % |
