Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 18000 | Metric tons | NA |
2003 | 14000 | Metric tons | -22.22% |
2004 | 18000 | Metric tons | 28.57% |
2005 | 20000 | Metric tons | 11.11% |
2006 | 21000 | Metric tons | 5.00% |
2007 | 21000 | Metric tons | 0.00% |
2008 | 21000 | Metric tons | 0.00% |
2009 | 21000 | Metric tons | 0.00% |
2010 | 21000 | Metric tons | 0.00% |
2011 | 21000 | Metric tons | 0.00% |
2012 | 21000 | Metric tons | 0.00% |
2013 | 23000 | Metric tons | 9.52% |