Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 6 | Thousand metric tons | NA |
| 2004 | 30 | Thousand metric tons | 400.00% |
| 2005 | 60 | Thousand metric tons | 100.00% |
| 2006 | 60 | Thousand metric tons | 0.00% |
| 2007 | 110 | Thousand metric tons | 83.33% |
