Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 2645 | Metric tons | NA |
| 2004 | 6074 | Metric tons | 129.64% |
| 2005 | 3029 | Metric tons | -50.13% |
| 2006 | 1884 | Metric tons | -37.80% |
| 2007 | 1400 | Metric tons | -25.69% |
| 2008 | 1600 | Metric tons | 14.29% |
| 2009 | 1700 | Metric tons | 6.25% |
