Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 610 | Metric tons | NA |
| 2004 | 1140 | Metric tons | 86.89% |
| 2005 | 1100 | Metric tons | -3.51% |
| 2006 | 760 | Metric tons | -30.91% |
| 2007 | 800 | Metric tons | 5.26% |
| 2008 | 800 | Metric tons | 0.00% |
| 2009 | 1430 | Metric tons | 78.75% |
| 2010 | 1600 | Metric tons | 11.89% |
| 2011 | 1500 | Metric tons | -6.25% |
| 2012 | 1350 | Metric tons | -10.00% |
| 2013 | 1600 | Metric tons | 18.52% |
