Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 10 | Thousand metric tons | NA |
| 2010 | 126 | Thousand metric tons | 1,160.00% |
| 2011 | 450 | Thousand metric tons | 257.14% |
| 2012 | 604 | Thousand metric tons | 34.22% |
| 2013 | 600 | Thousand metric tons | -0.66% |
