Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 1700 | Kilograms | NA |
| 2003 | 1700 | Kilograms | 0.00% |
| 2004 | 1700 | Kilograms | 0.00% |
| 2005 | 1300 | Kilograms | -23.53% |
| 2006 | 1200 | Kilograms | -7.69% |
| 2007 | 1200 | Kilograms | 0.00% |
| 2008 | 1600 | Kilograms | 33.33% |
| 2009 | 1800 | Kilograms | 12.50% |
