Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 2865 | Metric tons | NA |
| 2004 | 2274 | Metric tons | -20.63% |
| 2005 | 1835 | Metric tons | -19.31% |
| 2006 | 2000 | Metric tons | 8.99% |
| 2007 | 2000 | Metric tons | 0.00% |
| 2008 | 1000 | Metric tons | -50.00% |
