Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 563580 | Metric tons | NA |
2004 | 552507 | Metric tons | -1.96% |
2005 | 580000 | Metric tons | 4.98% |
2006 | 674766 | Metric tons | 16.34% |
2007 | 675000 | Metric tons | 0.03% |
2008 | 675000 | Metric tons | 0.00% |