Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1959 | Metric tons | NA |
| 2004 | 2000 | Metric tons | 2.09% |
| 2005 | 2000 | Metric tons | 0.00% |
| 2006 | 2000 | Metric tons | 0.00% |
| 2007 | 2000 | Metric tons | 0.00% |
| 2008 | 2000 | Metric tons | 0.00% |
| 2009 | 200 | Metric tons | -90.00% |
| 2011 | 5129 | Metric tons | 2,464.50% |
| 2012 | 5000 | Metric tons | -2.52% |
| 2013 | 5000 | Metric tons | 0.00% |
