Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 9 | Metric tons | NA |
| 2004 | 9 | Metric tons | 0.00% |
| 2006 | 19 | Metric tons | 111.11% |
| 2007 | 20 | Metric tons | 5.26% |
