Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 10 | Metric tons | NA |
| 2004 | 11 | Metric tons | 10.00% |
| 2005 | 10 | Metric tons | -9.09% |
| 2006 | 10 | Metric tons | 0.00% |
| 2007 | 10 | Metric tons | 0.00% |
| 2008 | 10 | Metric tons | 0.00% |
| 2008 | 9800 | Kilograms | 97,900.00% |
| 2009 | 11600 | Kilograms | 18.37% |
| 2009 | 4 | Metric tons | -99.97% |
| 2010 | 12500 | Kilograms | 312,400.00% |
| 2011 | 11600 | Kilograms | -7.20% |
| 2012 | 12600 | Kilograms | 8.62% |
