Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2008 | 164 | Kilograms | NA |
| 2009 | 185 | Kilograms | 12.80% |
| 2010 | 171 | Kilograms | -7.57% |
| 2011 | 202 | Kilograms | 18.13% |
| 2012 | 102 | Kilograms | -49.50% |
