Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 541 | Thousand metric tons | NA |
2004 | 566 | Thousand metric tons | 4.62% |
2005 | 583 | Thousand metric tons | 3.00% |
2006 | 627 | Thousand metric tons | 7.55% |
2007 | 638 | Thousand metric tons | 1.75% |