Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 33 | Thousand metric tons | NA |
| 2004 | 21 | Thousand metric tons | -36.36% |
| 2005 | 1.01699995994568 | Thousand metric tons | -95.16% |
| 2006 | 1.71899998188019 | Thousand metric tons | 69.03% |
| 2007 | 2 | Thousand metric tons | 16.35% |
