Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 35000 | Metric tons | NA |
| 2004 | 35000 | Metric tons | 0.00% |
| 2005 | 35000 | Metric tons | 0.00% |
| 2006 | 35000 | Metric tons | 0.00% |
| 2007 | 35000 | Metric tons | 0.00% |
| 2008 | 35000 | Metric tons | 0.00% |
| 2009 | 35000 | Metric tons | 0.00% |
| 2010 | 95 | Metric tons | -99.73% |
| 2011 | 229 | Metric tons | 141.05% |
| 2012 | 181 | Metric tons | -20.96% |
| 2013 | 53 | Metric tons | -70.72% |
