Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 23287 | Thousand metric tons | NA |
2003 | 24147 | Thousand metric tons | 3.69% |
2004 | 25380 | Thousand metric tons | 5.11% |
2005 | 26063.853515625 | Thousand metric tons | 2.69% |
2006 | 27056 | Thousand metric tons | 3.81% |
2007 | 30368.771484375 | Thousand metric tons | 12.24% |
2008 | 31823 | Thousand metric tons | 4.79% |
2009 | 36500 | Thousand metric tons | 14.70% |
2010 | 42970 | Thousand metric tons | 17.73% |
2011 | 48358 | Thousand metric tons | 12.54% |
2012 | 53000 | Thousand metric tons | 9.60% |