Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 12700 | Thousand metric tons | NA |
2004 | 12800 | Thousand metric tons | 0.79% |
2005 | 14400 | Thousand metric tons | 12.50% |
2006 | 13800 | Thousand metric tons | -4.17% |
2007 | 13800 | Thousand metric tons | 0.00% |
2008 | 13800 | Thousand metric tons | 0.00% |
2009 | 19759 | Thousand metric tons | 43.18% |
2010 | 17656 | Thousand metric tons | -10.64% |
2011 | 16369 | Thousand metric tons | -7.29% |
2012 | 13946 | Thousand metric tons | -14.80% |
2013 | 13870 | Thousand metric tons | -0.54% |