Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 402 | Metric tons | NA |
| 2004 | 570 | Metric tons | 41.79% |
| 2005 | 1855 | Metric tons | 225.44% |
| 2006 | 1466 | Metric tons | -20.97% |
| 2007 | 1600 | Metric tons | 9.14% |
| 2008 | 1700 | Metric tons | 6.25% |
| 2009 | 1800 | Metric tons | 5.88% |
