Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 188.695007324219 | Metric tons | NA |
| 2004 | 712.094970703125 | Metric tons | 277.38% |
| 2005 | 281.212005615234 | Metric tons | -60.51% |
| 2006 | 95.0999984741211 | Metric tons | -66.18% |
| 2007 | 196.399993896484 | Metric tons | 106.52% |
| 2008 | 395.600006103516 | Metric tons | 101.43% |
| 2009 | 404.667999267578 | Metric tons | 2.29% |
