Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 40 | Metric tons | NA |
| 2003 | 40 | Metric tons | 0.00% |
| 2004 | 40 | Metric tons | 0.00% |
| 2005 | 40 | Metric tons | 0.00% |
| 2006 | 45 | Metric tons | 12.50% |
| 2007 | 45 | Metric tons | 0.00% |
| 2008 | 6 | Metric tons | -86.67% |
| 2010 | 3 | Metric tons | -50.00% |
| 2012 | 1 | Metric tons | -66.67% |
