Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 3695 | Metric tons | NA |
| 2003 | 2552 | Metric tons | -30.93 % |
| 2004 | 1240 | Metric tons | -51.41 % |
| 2007 | 300 | Metric tons | -75.81 % |
| 2008 | 300 | Metric tons | 0.00 % |
