Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 15 | Thousand metric tons | NA |
| 2010 | 60 | Thousand metric tons | 300.00% |
| 2011 | 80 | Thousand metric tons | 33.33% |
| 2012 | 120 | Thousand metric tons | 50.00% |
| 2013 | 270 | Thousand metric tons | 125.00% |
