Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 380 | Thousand metric tons | NA |
2003 | 380 | Thousand metric tons | 0.00% |
2004 | 380 | Thousand metric tons | 0.00% |
2005 | 380 | Thousand metric tons | 0.00% |
2006 | 400 | Thousand metric tons | 5.26% |
2007 | 400 | Thousand metric tons | 0.00% |
2008 | 400 | Thousand metric tons | 0.00% |
2009 | 380 | Thousand metric tons | -5.00% |
2010 | 300 | Thousand metric tons | -21.05% |
2011 | 250 | Thousand metric tons | -16.67% |
2012 | 350 | Thousand metric tons | 40.00% |