Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 60 | Metric tons | NA |
| 2004 | 60 | Metric tons | 0.00% |
| 2005 | 8775 | Metric tons | 14,525.00% |
| 2006 | 4969 | Metric tons | -43.37% |
| 2007 | 12722 | Metric tons | 156.03% |
| 2008 | 12000 | Metric tons | -5.68% |
| 2009 | 6887 | Metric tons | -42.61% |
| 2010 | 1826 | Metric tons | -73.49% |
| 2011 | 9959 | Metric tons | 445.40% |
| 2012 | 14537 | Metric tons | 45.97% |
| 2013 | 19000 | Metric tons | 30.70% |
