Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 12214 | Metric tons | NA |
| 2004 | 9698 | Metric tons | -20.60 % |
| 2005 | 4722 | Metric tons | -51.31 % |
| 2006 | 5000 | Metric tons | 5.89 % |
| 2007 | 5000 | Metric tons | 0.00 % |
| 2008 | 5000 | Metric tons | 0.00 % |
| 2009 | 3500 | Metric tons | -30.00 % |
