Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 30 | Thousand metric tons | NA |
| 2004 | 30 | Thousand metric tons | 0.00% |
| 2005 | 30 | Thousand metric tons | 0.00% |
| 2006 | 30 | Thousand metric tons | 0.00% |
| 2007 | 30 | Thousand metric tons | 0.00% |
| 2008 | 30 | Thousand metric tons | 0.00% |
| 2009 | 423 | Thousand metric tons | 1,310.00% |
| 2010 | 430 | Thousand metric tons | 1.65% |
| 2011 | 440 | Thousand metric tons | 2.33% |
| 2012 | 440 | Thousand metric tons | 0.00% |
| 2013 | 475 | Thousand metric tons | 7.95% |
