Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 5000 | Kilograms | NA |
| 2003 | 6500 | Kilograms | 30.00% |
| 2004 | 4500 | Kilograms | -30.77% |
| 2005 | 4170 | Kilograms | -7.33% |
| 2006 | 8040 | Kilograms | 92.81% |
| 2007 | 9920 | Kilograms | 23.38% |
| 2008 | 11016 | Kilograms | 11.05% |
| 2009 | 14469 | Kilograms | 31.35% |
| 2010 | 16890 | Kilograms | 16.73% |
| 2011 | 24400 | Kilograms | 44.46% |
| 2012 | 29370 | Kilograms | 20.37% |
