Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 856 | Metric tons | NA |
| 2004 | 800 | Metric tons | -6.54% |
| 2005 | 602 | Metric tons | -24.75% |
| 2006 | 904 | Metric tons | 50.17% |
| 2007 | 971 | Metric tons | 7.41% |
| 2008 | 1000 | Metric tons | 2.99% |
| 2009 | 1000 | Metric tons | 0.00% |
