Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 1130 | Thousand metric tons | NA |
2003 | 1130 | Thousand metric tons | 0.00% |
2004 | 1150 | Thousand metric tons | 1.77% |
2005 | 920 | Thousand metric tons | -20.00% |
2006 | 1130 | Thousand metric tons | 22.83% |