Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 8879 | Kilograms | NA |
| 2004 | 6760 | Kilograms | -23.87 % |
| 2005 | 7058 | Kilograms | 4.41 % |
| 2006 | 6088 | Kilograms | -13.74 % |
| 2007 | 4161 | Kilograms | -31.65 % |
| 2008 | 4300 | Kilograms | 3.34 % |
| 2009 | 5000 | Kilograms | 16.28 % |
