Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 250 | Metric tons | NA |
| 2004 | 500 | Metric tons | 100.00% |
| 2005 | 2600 | Metric tons | 420.00% |
| 2006 | 65000 | Metric tons | 2,400.00% |
| 2007 | 111000 | Metric tons | 70.77% |
| 2008 | 65000 | Metric tons | -41.44% |
| 2009 | 63000 | Metric tons | -3.08% |
