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% |
| 2010 | 723 | Kilograms | -28.42% |
| 2011 | 341 | Kilograms | -52.84% |
| 2012 | 300 | Kilograms | -12.02% |
