Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2008 | 8 | Metric tons | NA |
| 2009 | 13 | Metric tons | 62.50% |
| 2010 | 17 | Metric tons | 30.77% |
| 2011 | 23 | Metric tons | 35.29% |
| 2012 | 30 | Metric tons | 30.43% |
