Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2009 | 78.2630004882813 | Thousand metric tons | NA |
2010 | 81.0660018920898 | Thousand metric tons | 3.58% |
2011 | 71 | Thousand metric tons | -12.42% |
2012 | 34 | Thousand metric tons | -52.11% |
2013 | 40 | Thousand metric tons | 17.65% |