Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 86365 | Metric tons | NA |
| 2010 | 2222 | Metric tons | -97.43% |
| 2011 | 5093 | Metric tons | 129.21% |
| 2012 | 9602 | Metric tons | 88.53% |
| 2013 | 9000 | Metric tons | -6.27% |
