Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 2000 | Thousand metric tons | NA |
2003 | 2000 | Thousand metric tons | 0.00% |
2004 | 2200 | Thousand metric tons | 10.00% |
2005 | 2400 | Thousand metric tons | 9.09% |
2006 | 2500 | Thousand metric tons | 4.17% |
2007 | 2500 | Thousand metric tons | 0.00% |
2008 | 2500 | Thousand metric tons | 0.00% |
2009 | 1500 | Thousand metric tons | -40.00% |
2010 | 2650 | Thousand metric tons | 76.67% |
2011 | 2820 | Thousand metric tons | 6.42% |
2012 | 2900 | Thousand metric tons | 2.84% |