Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 15000 | Metric tons | NA |
| 2004 | 15000 | Metric tons | 0.00% |
| 2005 | 6400 | Metric tons | -57.33% |
| 2006 | 4857 | Metric tons | -24.11% |
| 2007 | 5000 | Metric tons | 2.94% |
| 2008 | 5000 | Metric tons | 0.00% |
| 2009 | 3437 | Metric tons | -31.26% |
| 2010 | 3783 | Metric tons | 10.07% |
| 2011 | 3573 | Metric tons | -5.55% |
| 2012 | 2885 | Metric tons | -19.26% |
| 2013 | 4300 | Metric tons | 49.05% |
