Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 748 | Metric tons | NA |
| 2004 | 101 | Metric tons | -86.50% |
| 2007 | 533 | Metric tons | 427.72% |
| 2011 | 1255 | Metric tons | 135.46% |
| 2012 | 893 | Metric tons | -28.84% |
| 2013 | 358 | Metric tons | -59.91% |
