Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2005 | 51 | Metric tons | NA |
| 2006 | 61 | Metric tons | 19.61% |
| 2007 | 60 | Metric tons | -1.64% |
| 2008 | 91 | Metric tons | 51.67% |
| 2009 | 84 | Metric tons | -7.69% |
| 2010 | 85 | Metric tons | 1.19% |
| 2011 | 90 | Metric tons | 5.88% |
| 2012 | 90 | Metric tons | 0.00% |
| 2013 | 90 | Metric tons | 0.00% |
