Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 609 | Metric tons | NA |
| 2003 | 50 | Metric tons | -91.79% |
| 2004 | 50 | Metric tons | 0.00% |
| 2005 | 55 | Metric tons | 10.00% |
| 2006 | 65 | Metric tons | 18.18% |
| 2007 | 55 | Metric tons | -15.38% |
| 2008 | 50 | Metric tons | -9.09% |
| 2009 | 43 | Metric tons | -14.00% |
| 2010 | 42 | Metric tons | -2.33% |
| 2011 | 45 | Metric tons | 7.14% |
| 2012 | 55 | Metric tons | 22.22% |
