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 | 35 | Thousand metric tons | 16.67% |
2007 | 35 | Thousand metric tons | 0.00% |
2008 | 35 | Thousand metric tons | 0.00% |
2009 | 35 | Thousand metric tons | 0.00% |
2010 | 50 | Thousand metric tons | 42.86% |
2011 | 40 | Thousand metric tons | -20.00% |
2012 | 40 | Thousand metric tons | 0.00% |
2013 | 40 | Thousand metric tons | 0.00% |