Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 698 | Thousand metric tons | NA |
2004 | 695 | Thousand metric tons | -0.43% |
2005 | 701 | Thousand metric tons | 0.86% |
2006 | 679 | Thousand metric tons | -3.14% |
2007 | 680 | Thousand metric tons | 0.15% |