Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 226 | Thousand metric tons | NA |
2004 | 272 | Thousand metric tons | 20.35 % |
2005 | 263 | Thousand metric tons | -3.31 % |
2006 | 306 | Thousand metric tons | 16.35 % |
2007 | 351 | Thousand metric tons | 14.71 % |
2008 | 330 | Thousand metric tons | -5.98 % |
2009 | 330 | Thousand metric tons | 0.00 % |
2010 | 330 | Thousand metric tons | 0.00 % |
2011 | 330 | Thousand metric tons | 0.00 % |
2012 | 330 | Thousand metric tons | 0.00 % |