Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 987.869018554688 | Thousand metric tons | NA |
2004 | 1137 | Thousand metric tons | 15.10 % |
2005 | 1074 | Thousand metric tons | -5.54 % |
2006 | 1115 | Thousand metric tons | 3.82 % |
2007 | 1147 | Thousand metric tons | 2.87 % |
2008 | 1109 | Thousand metric tons | -3.31 % |
2009 | 923 | Thousand metric tons | -16.77 % |
2010 | 635 | Thousand metric tons | -31.20 % |
2011 | 1072 | Thousand metric tons | 68.82 % |
2012 | 1065 | Thousand metric tons | -0.65 % |