Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 1700 | Metric tons | NA |
| 2003 | 2100 | Metric tons | 23.53% |
| 2004 | 3500 | Metric tons | 66.67% |
| 2005 | 3500 | Metric tons | 0.00% |
| 2006 | 3500 | Metric tons | 0.00% |
| 2007 | 3500 | Metric tons | 0.00% |
| 2008 | 3500 | Metric tons | 0.00% |
| 2009 | 5400 | Metric tons | 54.29% |
| 2010 | 5400 | Metric tons | 0.00% |
| 2011 | 5400 | Metric tons | 0.00% |
| 2012 | 5400 | Metric tons | 0.00% |
| 2013 | 5400 | Metric tons | 0.00% |
