Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 1110 | Kilograms | NA |
| 2003 | 2142 | Kilograms | 92.97 % |
| 2004 | 2431 | Kilograms | 13.49 % |
| 2005 | 3868 | Kilograms | 59.11 % |
| 2006 | 3818 | Kilograms | -1.29 % |
| 2007 | 3964 | Kilograms | 3.82 % |
| 2008 | 4160 | Kilograms | 4.94 % |
| 2009 | 4200 | Kilograms | 0.96 % |
