Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 25 | Metric tons | NA |
| 2004 | 24 | Metric tons | -4.00% |
| 2005 | 20 | Metric tons | -16.67% |
| 2006 | 20 | Metric tons | 0.00% |
| 2007 | 20 | Metric tons | 0.00% |
| 2008 | 20 | Metric tons | 0.00% |
| 2009 | 6 | Metric tons | -70.00% |
| 2010 | 9 | Metric tons | 50.00% |
