Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 500000 | Metric tons | NA |
2004 | 400000 | Metric tons | -20.00% |
2005 | 400000 | Metric tons | 0.00% |
2006 | 360000 | Metric tons | -10.00% |
2007 | 390000 | Metric tons | 8.33% |
2008 | 380000 | Metric tons | -2.56% |
2009 | 440000 | Metric tons | 15.79% |
2010 | 400000 | Metric tons | -9.09% |
2011 | 440000 | Metric tons | 10.00% |
2012 | 420000 | Metric tons | -4.55% |
2013 | 420000 | Metric tons | 0.00% |