Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2009 | 2040 | Thousand metric tons | NA |
2010 | 2440 | Thousand metric tons | 19.61 % |
2011 | 2540 | Thousand metric tons | 4.10 % |
2012 | 2240 | Thousand metric tons | -11.81 % |
2013 | 2240 | Thousand metric tons | 0.00 % |