Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 50 | Metric tons | NA |
| 2004 | 50 | Metric tons | 0.00% |
| 2005 | 45 | Metric tons | -10.00% |
| 2006 | 50 | Metric tons | 11.11% |
| 2007 | 50 | Metric tons | 0.00% |
| 2008 | 45 | Metric tons | -10.00% |
| 2008 | 57000 | Kilograms | 126,566.70% |
| 2009 | 50000 | Kilograms | -12.28% |
| 2009 | 40 | Metric tons | -99.92% |
| 2010 | 67000 | Kilograms | 167,400.00% |
| 2011 | 64000 | Kilograms | -4.48% |
| 2012 | 62000 | Kilograms | -3.13% |
