Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 27 | Metric tons | NA |
| 2003 | 27 | Metric tons | 0.00 % |
| 2004 | 28 | Metric tons | 3.70 % |
| 2005 | 28 | Metric tons | 0.00 % |
| 2006 | 28.1000003814697 | Metric tons | 0.36 % |
| 2007 | 10 | Metric tons | -64.41 % |
| 2008 | 10 | Metric tons | 0.00 % |
| 2009 | 10 | Metric tons | 0.00 % |
