Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 3456 | Metric tons | NA |
| 2004 | 6886 | Metric tons | 99.25 % |
| 2005 | 4954 | Metric tons | -28.06 % |
| 2006 | 1690 | Metric tons | -65.89 % |
| 2007 | 7393 | Metric tons | 337.46 % |
| 2008 | 7000 | Metric tons | -5.32 % |
| 2009 | 7000 | Metric tons | 0.00 % |
