Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 15469 | Kilograms | NA |
| 2003 | 12564 | Kilograms | -18.78 % |
| 2004 | 21330 | Kilograms | 69.77 % |
| 2005 | 14023 | Kilograms | -34.26 % |
| 2006 | 11354 | Kilograms | -19.03 % |
| 2007 | 6750 | Kilograms | -40.55 % |
| 2008 | 3600 | Kilograms | -46.67 % |
| 2009 | 4200 | Kilograms | 16.67 % |
