Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 10 | Thousand metric tons | NA |
| 2004 | 8 | Thousand metric tons | -20.00% |
| 2005 | 1.45000004768372 | Thousand metric tons | -81.88% |
| 2006 | 1.5 | Thousand metric tons | 3.45% |
| 2007 | 9 | Thousand metric tons | 500.00% |
| 2008 | 2 | Thousand metric tons | -77.78% |
