Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 19 | Metric tons | NA |
| 2010 | 20 | Metric tons | 5.26% |
| 2011 | 18 | Metric tons | -10.00% |
| 2012 | 33 | Metric tons | 83.33% |
