Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2008 | 11835 | Kilograms | NA |
| 2009 | 12955 | Kilograms | 9.46% |
| 2010 | 10452 | Kilograms | -19.32% |
| 2011 | 16469 | Kilograms | 57.57% |
| 2012 | 16500 | Kilograms | 0.19% |
