Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 88 | Metric tons | NA |
| 2010 | 176 | Metric tons | 100.00% |
| 2011 | 90 | Metric tons | -48.86% |
| 2012 | 52 | Metric tons | -42.22% |
| 2013 | 50 | Metric tons | -3.85% |
