Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 240000 | Metric tons | NA |
2004 | 240000 | Metric tons | 0.00% |
2005 | 240000 | Metric tons | 0.00% |
2006 | 240000 | Metric tons | 0.00% |
2007 | 230000 | Metric tons | -4.17% |
2008 | 230000 | Metric tons | 0.00% |
2009 | 220000 | Metric tons | -4.35% |
2010 | 210000 | Metric tons | -4.55% |
2011 | 200000 | Metric tons | -4.76% |
2012 | 200000 | Metric tons | 0.00% |
2013 | 190000 | Metric tons | -5.00% |