Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 48353 | Metric tons | NA |
2004 | 57149 | Metric tons | 18.19% |
2005 | 60000 | Metric tons | 4.99% |
2006 | 60000 | Metric tons | 0.00% |
2007 | 60000 | Metric tons | 0.00% |
2008 | 60000 | Metric tons | 0.00% |