Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 13581 | Kilograms | NA |
| 2003 | 11707 | Kilograms | -13.80 % |
| 2004 | 11148 | Kilograms | -4.77 % |
| 2005 | 8325 | Kilograms | -25.32 % |
| 2006 | 5668 | Kilograms | -31.92 % |
| 2007 | 7412 | Kilograms | 30.77 % |
| 2008 | 8131 | Kilograms | 9.70 % |
| 2009 | 8183 | Kilograms | 0.64 % |
