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 | 8000 | Metric tons | 5.82 % |
