Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 276 | Metric tons | NA |
| 2004 | 168 | Metric tons | -39.13% |
| 2005 | 120 | Metric tons | -28.57% |
| 2006 | 240 | Metric tons | 100.00% |
| 2007 | 200 | Metric tons | -16.67% |
| 2008 | 74 | Metric tons | -63.00% |
| 2009 | 115 | Metric tons | 55.41% |
| 2010 | 155 | Metric tons | 34.78% |
| 2011 | 99 | Metric tons | -36.13% |
| 2012 | 100 | Metric tons | 1.01% |
