Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 5239 | Kilograms | NA |
| 2003 | 5106 | Kilograms | -2.54% |
| 2004 | 5000 | Kilograms | -2.08% |
| 2005 | 3625 | Kilograms | -27.50% |
| 2006 | 3158 | Kilograms | -12.88% |
| 2007 | 2703 | Kilograms | -14.41% |
| 2008 | 7508 | Kilograms | 177.77% |
| 2009 | 14914 | Kilograms | 98.64% |
| 2010 | 26317 | Kilograms | 76.46% |
| 2011 | 23379 | Kilograms | -11.16% |
| 2012 | 46133 | Kilograms | 97.33% |
