Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 7675 | Metric tons | NA |
| 2004 | 10267 | Metric tons | 33.77% |
| 2005 | 4298 | Metric tons | -58.14% |
| 2006 | 6588 | Metric tons | 53.28% |
| 2007 | 6000 | Metric tons | -8.93% |
| 2008 | 5000 | Metric tons | -16.67% |
| 2009 | 2463 | Metric tons | -50.74% |
| 2010 | 4000 | Metric tons | 62.40% |
| 2011 | 7000 | Metric tons | 75.00% |
| 2012 | 6000 | Metric tons | -14.29% |
| 2013 | 4000 | Metric tons | -33.33% |
