Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 33 | Metric tons | NA |
| 2003 | 31 | Metric tons | -6.06% |
| 2004 | 35 | Metric tons | 12.90% |
| 2005 | 38.1339988708496 | Metric tons | 8.95% |
| 2006 | 30 | Metric tons | -21.33% |
| 2007 | 36 | Metric tons | 20.00% |
| 2008 | 4 | Metric tons | -88.89% |
| 2009 | 4 | Metric tons | 0.00% |
| 2010 | 5 | Metric tons | 25.00% |
| 2011 | 8 | Metric tons | 60.00% |
| 2012 | 9 | Metric tons | 12.50% |
