Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 310 | Kilograms | NA |
| 2003 | 166 | Kilograms | -46.45% |
| 2004 | 233 | Kilograms | 40.36% |
| 2005 | 266 | Kilograms | 14.16% |
| 2006 | 277 | Kilograms | 4.14% |
| 2007 | 162 | Kilograms | -41.52% |
| 2008 | 175 | Kilograms | 8.02% |
| 2009 | 274 | Kilograms | 56.57% |
| 2010 | 235 | Kilograms | -14.23% |
| 2011 | 209 | Kilograms | -11.06% |
| 2012 | 200 | Kilograms | -4.31% |
