Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 3217 | Thousand metric tons | NA |
2003 | 3465 | Thousand metric tons | 7.71% |
2004 | 3828.67700195313 | Thousand metric tons | 10.50% |
2005 | 3978.05590820313 | Thousand metric tons | 3.90% |
2006 | 4238.81787109375 | Thousand metric tons | 6.56% |
2007 | 4898.52978515625 | Thousand metric tons | 15.56% |
2008 | 4710 | Thousand metric tons | -3.85% |
2009 | 3637 | Thousand metric tons | -22.78% |
2010 | 3345 | Thousand metric tons | -8.03% |
2011 | 3831 | Thousand metric tons | 14.53% |
2012 | 3350 | Thousand metric tons | -12.56% |