Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2008 | 1700 | Metric tons | NA |
| 2009 | 1800 | Metric tons | 5.88% |
| 2010 | 2200 | Metric tons | 22.22% |
| 2011 | 4900 | Metric tons | 122.73% |
| 2012 | 4900 | Metric tons | 0.00% |
