Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2010 | 1.5 | Metric tons | NA |
2011 | 1.21700000762939 | Metric tons | -18.87% |
2012 | 0.625999987125397 | Metric tons | -48.56% |