Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 315 | Metric tons | NA |
| 2010 | 395 | Metric tons | 25.40% |
| 2011 | 515 | Metric tons | 30.38% |
| 2012 | 457 | Metric tons | -11.26% |
| 2013 | 460 | Metric tons | 0.66% |
