Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 456 | Metric tons | NA |
| 2003 | 506 | Metric tons | 10.96% |
| 2004 | 424 | Metric tons | -16.21% |
| 2005 | 120 | Metric tons | -71.70% |
| 2006 | 150 | Metric tons | 25.00% |
| 2007 | 150 | Metric tons | 0.00% |
| 2008 | 150 | Metric tons | 0.00% |
| 2009 | 5000 | Metric tons | 3,233.33% |
| 2010 | 160 | Metric tons | -96.80% |
