Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2008 | 2109 | Metric tons | NA |
| 2009 | 12937 | Metric tons | 513.42% |
| 2010 | 10015 | Metric tons | -22.59% |
| 2011 | 11777 | Metric tons | 17.59% |
| 2012 | 11737 | Metric tons | -0.34% |
