Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 3 | Metric tons | NA |
| 2003 | 3 | Metric tons | 0.00% |
| 2004 | 2 | Metric tons | -33.33% |
| 2005 | 1.20000004768372 | Metric tons | -40.00% |
