Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 300000 | Metric tons | NA |
2004 | 300000 | Metric tons | 0.00% |
2005 | 300000 | Metric tons | 0.00% |
2006 | 300000 | Metric tons | 0.00% |
2007 | 300000 | Metric tons | 0.00% |
2008 | 300000 | Metric tons | 0.00% |
2009 | 195000 | Metric tons | -35.00% |
2010 | 185000 | Metric tons | -5.13% |
2011 | 211000 | Metric tons | 14.05% |
2012 | 210000 | Metric tons | -0.47% |
2013 | 210000 | Metric tons | 0.00% |