Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 52 | Metric tons | NA |
| 2003 | 51 | Metric tons | -1.92 % |
| 2004 | 15 | Metric tons | -70.59 % |
| 2005 | 31.5 | Metric tons | 110.00 % |
| 2006 | 30.8999996185303 | Metric tons | -1.90 % |
| 2007 | 82.3000030517578 | Metric tons | 166.34 % |
| 2008 | 96 | Metric tons | 16.65 % |
| 2009 | 95 | Metric tons | -1.04 % |
