Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 111 | Metric tons | NA |
| 2004 | 110 | Metric tons | -0.90% |
| 2005 | 4080 | Metric tons | 3,609.09% |
| 2006 | 4500 | Metric tons | 10.29% |
| 2007 | 160 | Metric tons | -96.44% |
