Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 24800 | Metric tons | NA |
2004 | 25400 | Metric tons | 2.42 % |
2005 | 26700 | Metric tons | 5.12 % |
2006 | 28000 | Metric tons | 4.87 % |
2007 | 29000 | Metric tons | 3.57 % |
2008 | 30000 | Metric tons | 3.45 % |
2009 | 31000 | Metric tons | 3.33 % |