Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2004 | 3336 | Metric tons | NA |
| 2005 | 17318 | Metric tons | 419.12% |
| 2006 | 3515 | Metric tons | -79.70% |
| 2007 | 9707 | Metric tons | 176.16% |
| 2008 | 17047 | Metric tons | 75.62% |
| 2009 | 92098 | Metric tons | 440.26% |
| 2010 | 11417 | Metric tons | -87.60% |
| 2011 | 423 | Metric tons | -96.30% |
| 2012 | 24000 | Metric tons | 5,573.76% |
| 2013 | 24000 | Metric tons | 0.00% |
