Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 354500 | Metric tons | NA |
2004 | 346500 | Metric tons | -2.26 % |
2005 | 305500 | Metric tons | -11.83 % |
2006 | 314700 | Metric tons | 3.01 % |
2007 | 292600 | Metric tons | -7.02 % |
2008 | 230100 | Metric tons | -21.36 % |
2009 | 230000 | Metric tons | -0.04 % |
2010 | 214100 | Metric tons | -6.91 % |
2011 | 223100 | Metric tons | 4.20 % |
2012 | 241200 | Metric tons | 8.11 % |
2013 | 242000 | Metric tons | 0.33 % |