Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 2129 | Thousand metric tons | NA |
2003 | 2570 | Thousand metric tons | 20.71% |
2004 | 3662 | Thousand metric tons | 42.49% |
2005 | 3974.80004882813 | Thousand metric tons | 8.54% |
2006 | 4880.2001953125 | Thousand metric tons | 22.78% |
2007 | 5698.60009765625 | Thousand metric tons | 16.77% |
2008 | 5837 | Thousand metric tons | 2.43% |
2009 | 5694 | Thousand metric tons | -2.45% |
2010 | 6686 | Thousand metric tons | 17.42% |
2011 | 7642 | Thousand metric tons | 14.30% |
2012 | 6392 | Thousand metric tons | -16.36% |