Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 2216 | Kilograms | NA |
| 2003 | 1500 | Kilograms | -32.31% |
| 2004 | 2334 | Kilograms | 55.60% |
| 2005 | 3151 | Kilograms | 35.00% |
| 2006 | 3000 | Kilograms | -4.79% |
| 2007 | 2820 | Kilograms | -6.00% |
| 2008 | 2182 | Kilograms | -22.62% |
| 2009 | 1690 | Kilograms | -22.55% |
| 2010 | 1740 | Kilograms | 2.96% |
| 2011 | 1736 | Kilograms | -0.23% |
| 2012 | 1725 | Kilograms | -0.63% |
