Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 197 | Metric tons | NA |
| 2003 | 192 | Metric tons | -2.54 % |
| 2004 | 300 | Metric tons | 56.25 % |
| 2005 | 140 | Metric tons | -53.33 % |
| 2006 | 390 | Metric tons | 178.57 % |
| 2007 | 740 | Metric tons | 89.74 % |
| 2008 | 980 | Metric tons | 32.43 % |
| 2009 | 850 | Metric tons | -13.27 % |
