Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 642 | Metric tons | NA |
| 2004 | 561 | Metric tons | -12.62 % |
| 2005 | 732 | Metric tons | 30.48 % |
| 2006 | 720 | Metric tons | -1.64 % |
| 2007 | 1129 | Metric tons | 56.81 % |
| 2008 | 1100 | Metric tons | -2.57 % |
| 2009 | 1100 | Metric tons | 0.00 % |
