Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 23 | Metric tons | NA |
2003 | 23 | Metric tons | 0.00% |
2004 | 25 | Metric tons | 8.70% |
2005 | 25 | Metric tons | 0.00% |
2006 | 25 | Metric tons | 0.00% |
2007 | 26 | Metric tons | 4.00% |
2008 | 25 | Metric tons | -3.85% |
2009 | 25 | Metric tons | 0.00% |