Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 2700 | Kilograms | NA |
| 2003 | 2700 | Kilograms | 0.00% |
| 2004 | 3000 | Kilograms | 11.11% |
| 2005 | 1927 | Kilograms | -35.77% |
| 2006 | 1920 | Kilograms | -0.36% |
| 2007 | 2000 | Kilograms | 4.17% |
| 2008 | 1672 | Kilograms | -16.40% |
| 2009 | 1361 | Kilograms | -18.60% |
| 2010 | 2049 | Kilograms | 50.55% |
| 2011 | 2240 | Kilograms | 9.32% |
| 2012 | 2401 | Kilograms | 7.19% |
