Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 1000 | Thousand metric tons | NA |
2004 | 1000 | Thousand metric tons | 0.00% |
2005 | 1158 | Thousand metric tons | 15.80% |
2006 | 1252 | Thousand metric tons | 8.12% |
2007 | 1264 | Thousand metric tons | 0.96% |