Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2008 | 4.69999980926514 | Metric tons | NA |
2009 | 13.5 | Metric tons | 187.23% |
2010 | 17.7999992370605 | Metric tons | 31.85% |
2011 | 18 | Metric tons | 1.12% |
2012 | 19.3999996185303 | Metric tons | 7.78% |