Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 1130 | Metric tons | NA |
| 2003 | 793 | Metric tons | -29.82% |
| 2004 | 586 | Metric tons | -26.10% |
| 2005 | 158 | Metric tons | -73.04% |
| 2006 | 190 | Metric tons | 20.25% |
| 2007 | 120 | Metric tons | -36.84% |
| 2008 | 120 | Metric tons | 0.00% |
| 2009 | 166 | Metric tons | 38.33% |
| 2010 | 291 | Metric tons | 75.30% |
| 2011 | 282 | Metric tons | -3.09% |
| 2012 | 124 | Metric tons | -56.03% |
| 2013 | 200 | Metric tons | 61.29% |
