Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 25 | Metric tons | NA |
| 2004 | 39 | Metric tons | 56.00% |
| 2005 | 3 | Metric tons | -92.31% |
| 2006 | 6 | Metric tons | 100.00% |
| 2007 | 35 | Metric tons | 483.33% |
| 2008 | 38 | Metric tons | 8.57% |
| 2009 | 36 | Metric tons | -5.26% |
| 2010 | 32 | Metric tons | -11.11% |
| 2011 | 31 | Metric tons | -3.13% |
| 2012 | 37 | Metric tons | 19.35% |
| 2013 | 30 | Metric tons | -18.92% |
