Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 9700 | Metric tons | NA |
| 2004 | 1800 | Metric tons | -81.44% |
| 2005 | 7876 | Metric tons | 337.56% |
| 2006 | 4487 | Metric tons | -43.03% |
| 2007 | 5000 | Metric tons | 11.43% |
| 2008 | 5000 | Metric tons | 0.00% |
| 2009 | 5000 | Metric tons | 0.00% |
| 2010 | 5000 | Metric tons | 0.00% |
| 2011 | 4800 | Metric tons | -4.00% |
| 2012 | 4900 | Metric tons | 2.08% |
| 2013 | 5000 | Metric tons | 2.04% |
