Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 366 | Metric tons | NA |
| 2003 | 360 | Metric tons | -1.64 % |
| 2004 | 400 | Metric tons | 11.11 % |
| 2005 | 450 | Metric tons | 12.50 % |
| 2006 | 450 | Metric tons | 0.00 % |
| 2007 | 700 | Metric tons | 55.56 % |
| 2008 | 700 | Metric tons | 0.00 % |
| 2009 | 700 | Metric tons | 0.00 % |
