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 | 8000 | Metric tons | -38.22% |
| 2010 | 13000 | Metric tons | 62.50% |
| 2011 | 14000 | Metric tons | 7.69% |
| 2012 | 14000 | Metric tons | 0.00% |
