Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 102 | Thousand metric tons | NA |
2004 | 137 | Thousand metric tons | 34.31 % |
2005 | 200 | Thousand metric tons | 45.99 % |
2006 | 250 | Thousand metric tons | 25.00 % |
2007 | 250 | Thousand metric tons | 0.00 % |