Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 87795 | Metric tons | NA |
2004 | 88194 | Metric tons | 0.45% |
2005 | 114708 | Metric tons | 30.06% |
2006 | 110000 | Metric tons | -4.10% |
2007 | 110000 | Metric tons | 0.00% |
2008 | 110000 | Metric tons | 0.00% |
2009 | 110000 | Metric tons | 0.00% |