Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 5 | Metric tons | NA |
| 2003 | 9 | Metric tons | 80.00% |
| 2004 | 7 | Metric tons | -22.22% |
| 2005 | 6.30000019073486 | Metric tons | -10.00% |
| 2006 | 4.09999990463257 | Metric tons | -34.92% |
| 2007 | 4 | Metric tons | -2.44% |
| 2008 | 4 | Metric tons | 0.00% |
| 2009 | 4 | Metric tons | 0.00% |
| 2010 | 4 | Metric tons | 0.00% |
| 2011 | 4 | Metric tons | 0.00% |
| 2012 | 4 | Metric tons | 0.00% |
