Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2009 | 807.348022460938 | Thousand metric tons | NA |
2010 | 770.635986328125 | Thousand metric tons | -4.55% |
2011 | 738 | Thousand metric tons | -4.23% |
2012 | 725 | Thousand metric tons | -1.76% |
2013 | 717.611999511719 | Thousand metric tons | -1.02% |