Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 200 | Thousand metric tons | NA |
2004 | 200 | Thousand metric tons | 0.00% |
2005 | 200 | Thousand metric tons | 0.00% |
2006 | 200 | Thousand metric tons | 0.00% |
2007 | 200 | Thousand metric tons | 0.00% |
2008 | 200 | Thousand metric tons | 0.00% |
2009 | 326.635986328125 | Thousand metric tons | 63.32% |
2010 | 253.865997314453 | Thousand metric tons | -22.28% |
2011 | 230.908004760742 | Thousand metric tons | -9.04% |
2012 | 219.481002807617 | Thousand metric tons | -4.95% |
2013 | 224.386993408203 | Thousand metric tons | 2.24% |