Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 70 | Metric tons | NA |
| 2004 | 70 | Metric tons | 0.00% |
| 2005 | 70 | Metric tons | 0.00% |
| 2006 | 55 | Metric tons | -21.43% |
| 2007 | 60 | Metric tons | 9.09% |
| 2008 | 65 | Metric tons | 8.33% |
| 2008 | 65000 | Kilograms | 99,900.00% |
| 2009 | 67000 | Kilograms | 3.08% |
| 2009 | 67 | Metric tons | -99.90% |
| 2010 | 69000 | Kilograms | 102,885.10% |
| 2011 | 70000 | Kilograms | 1.45% |
| 2012 | 71000 | Kilograms | 1.43% |
