Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 3570 | Kilograms | NA |
| 2003 | 1313 | Kilograms | -63.22% |
| 2004 | 1219 | Kilograms | -7.16% |
| 2005 | 1335 | Kilograms | 9.52% |
| 2006 | 1324 | Kilograms | -0.82% |
| 2007 | 1243 | Kilograms | -6.12% |
| 2008 | 4205 | Kilograms | 238.29% |
| 2009 | 6947 | Kilograms | 65.21% |
| 2010 | 5310 | Kilograms | -23.56% |
| 2011 | 9871 | Kilograms | 85.89% |
| 2012 | 10400 | Kilograms | 5.36% |
