Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2008 | 33073 | Metric tons | NA |
2009 | 35000 | Metric tons | 5.83% |
2010 | 37000 | Metric tons | 5.71% |
2011 | 35281 | Metric tons | -4.65% |
2012 | 37670 | Metric tons | 6.77% |