Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2008 | 1226 | Metric tons, gross weight | NA |
| 2010 | 309 | Metric tons, gross weight | -74.80% |
| 2011 | 361 | Metric tons, gross weight | 16.83% |
| 2012 | 369 | Metric tons, gross weight | 2.22% |
