Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 12000 | Metric tons | NA |
| 2004 | 27100 | Metric tons | 125.83 % |
| 2005 | 13000 | Metric tons | -52.03 % |
| 2006 | 16000 | Metric tons | 23.08 % |
| 2007 | 11000 | Metric tons | -31.25 % |
| 2008 | 12950 | Metric tons | 17.73 % |
| 2009 | 13000 | Metric tons | 0.39 % |
