Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 369 | Kilograms | NA |
| 2003 | 365 | Kilograms | -1.08 % |
| 2004 | 597 | Kilograms | 63.56 % |
| 2005 | 697 | Kilograms | 16.75 % |
| 2006 | 377 | Kilograms | -45.91 % |
| 2007 | 236 | Kilograms | -37.40 % |
| 2008 | 656 | Kilograms | 177.97 % |
| 2009 | 1010 | Kilograms | 53.96 % |
