Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 187 | Metric tons | NA |
| 2004 | 220 | Metric tons | 17.65% |
| 2005 | 276 | Metric tons | 25.45% |
| 2006 | 188 | Metric tons | -31.88% |
| 2007 | 490 | Metric tons | 160.64% |
| 2008 | 490 | Metric tons | 0.00% |
| 2009 | 430 | Metric tons | -12.24% |
