Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 150 | Metric tons | NA |
| 2004 | 150 | Metric tons | 0.00% |
| 2005 | 150 | Metric tons | 0.00% |
| 2006 | 150 | Metric tons | 0.00% |
| 2007 | 150 | Metric tons | 0.00% |
| 2008 | 150 | Metric tons | 0.00% |
| 2009 | 150 | Metric tons | 0.00% |
| 2009 | 420 | Metric tons | 180.00% |
| 2010 | 445 | Metric tons | 5.95% |
| 2011 | 460 | Metric tons | 3.37% |
| 2012 | 480 | Metric tons | 4.35% |
| 2013 | 500 | Metric tons | 4.17% |
