Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 2276 | Metric tons | NA |
| 2004 | 2823 | Metric tons | 24.03% |
| 2005 | 11268 | Metric tons | 299.15% |
| 2006 | 7341 | Metric tons | -34.85% |
| 2007 | 7000 | Metric tons | -4.65% |
