Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 12000 | Metric tons | NA |
| 2004 | 12000 | Metric tons | 0.00% |
| 2005 | 12000 | Metric tons | 0.00% |
| 2006 | 12000 | Metric tons | 0.00% |
| 2007 | 5770 | Metric tons | -51.92% |
| 2008 | 7560 | Metric tons | 31.02% |
| 2009 | 4500 | Metric tons | -40.48% |
| 2010 | 2865 | Metric tons | -36.33% |
| 2011 | 3000 | Metric tons | 4.71% |
| 2012 | 3000 | Metric tons | 0.00% |
| 2013 | 3000 | Metric tons | 0.00% |
