Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 640 | Metric tons | NA |
| 2004 | 640 | Metric tons | 0.00% |
| 2005 | 640 | Metric tons | 0.00% |
| 2006 | 640 | Metric tons | 0.00% |
| 2007 | 400 | Metric tons | -37.50% |
| 2008 | 400 | Metric tons | 0.00% |
| 2009 | 278 | Metric tons | -30.50% |
| 2010 | 290 | Metric tons | 4.32% |
| 2011 | 300 | Metric tons | 3.45% |
| 2012 | 300 | Metric tons | 0.00% |
| 2013 | 300 | Metric tons | 0.00% |
