Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 166 | Metric tons | NA |
| 2004 | 267 | Metric tons | 60.84% |
| 2005 | 260 | Metric tons | -2.62% |
| 2006 | 299 | Metric tons | 15.00% |
| 2007 | 282 | Metric tons | -5.69% |
| 2008 | 298 | Metric tons | 5.67% |
| 2009 | 322 | Metric tons | 8.05% |
| 2010 | 341 | Metric tons | 5.90% |
| 2011 | 105 | Metric tons | -69.21% |
| 2012 | 100 | Metric tons | -4.76% |
| 2013 | 100 | Metric tons | 0.00% |
