Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 208 | Metric tons | NA |
| 2004 | 361 | Metric tons | 73.56% |
| 2005 | 445 | Metric tons | 23.27% |
| 2006 | 478 | Metric tons | 7.42% |
| 2007 | 510 | Metric tons | 6.69% |
| 2008 | 510 | Metric tons | 0.00% |
