Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2009 | 1640 | Thousand metric tons | NA |
2010 | 1800 | Thousand metric tons | 9.76% |
2011 | 1864 | Thousand metric tons | 3.56% |
2012 | 1957 | Thousand metric tons | 4.99% |
2013 | 2000 | Thousand metric tons | 2.20% |