Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 11200 | Metric tons, gross weight | NA |
2003 | 35393 | Metric tons, gross weight | 216.01% |
2004 | 33686 | Metric tons, gross weight | -4.82% |
2005 | 26043 | Metric tons, gross weight | -22.69% |
2006 | 67975 | Metric tons, gross weight | 161.01% |