Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2005 | 23 | Metric tons | NA |
| 2006 | 21 | Metric tons | -8.70% |
| 2007 | 20 | Metric tons | -4.76% |
| 2008 | 20 | Metric tons | 0.00% |
| 2009 | 21 | Metric tons | 5.00% |
