Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 790 | Metric tons | NA |
| 2003 | 1800 | Metric tons | 127.85% |
| 2004 | 1000 | Metric tons | -44.44% |
| 2005 | 1300 | Metric tons | 30.00% |
| 2006 | 1400 | Metric tons | 7.69% |
| 2007 | 180 | Metric tons | -87.14% |
| 2008 | 185 | Metric tons | 2.78% |
| 2009 | 400 | Metric tons | 116.22% |
| 2010 | 520 | Metric tons | 30.00% |
| 2011 | 570 | Metric tons | 9.62% |
| 2012 | 570 | Metric tons | 0.00% |
| 2013 | 570 | Metric tons | 0.00% |
