Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2009 | 71409 | Metric tons | NA |
2010 | 72000 | Metric tons | 0.83% |
2011 | 55976 | Metric tons | -22.26% |
2012 | 60000 | Metric tons | 7.19% |
2013 | 70000 | Metric tons | 16.67% |