Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 500000 | Metric tons | NA |
2004 | 508000 | Metric tons | 1.60% |
2005 | 494000 | Metric tons | -2.76% |
2006 | 433190 | Metric tons | -12.31% |
2007 | 570000 | Metric tons | 31.58% |
2008 | 490567 | Metric tons | -13.94% |
2009 | 500000 | Metric tons | 1.92% |