Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2009 | 594.578002929688 | Thousand metric tons | NA |
2010 | 618.960998535156 | Thousand metric tons | 4.10% |
2011 | 631.294982910156 | Thousand metric tons | 1.99% |
2012 | 520.283996582031 | Thousand metric tons | -17.58% |
2013 | 562 | Thousand metric tons | 8.02% |