Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 1400 | Metric tons | NA |
| 2010 | 1500 | Metric tons | 7.14% |
| 2011 | 3156 | Metric tons | 110.40% |
| 2012 | 6866 | Metric tons | 117.55% |
| 2013 | 6000 | Metric tons | -12.61% |
