Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 5.5 | Metric tons | NA |
| 2004 | 5.5 | Metric tons | 0.00% |
| 2005 | 7 | Metric tons | 27.27% |
| 2006 | 6 | Metric tons | -14.29% |
| 2007 | 5 | Metric tons | -16.67% |
| 2008 | 5976 | Kilograms | 119,420.00% |
| 2008 | 6 | Metric tons | -99.90% |
| 2009 | 25 | Metric tons | 316.67% |
| 2009 | 1629 | Kilograms | 6,416.00% |
| 2011 | 2499 | Kilograms | 53.41% |
| 2012 | 11080 | Kilograms | 343.38% |
