Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 6438 | Metric tons | NA |
| 2004 | 81688 | Metric tons | 1,168.84% |
| 2005 | 135451 | Metric tons | 65.82% |
| 2006 | 20034 | Metric tons | -85.21% |
| 2007 | 23569 | Metric tons | 17.65% |
| 2008 | 62749 | Metric tons | 166.24% |
| 2009 | 14284 | Metric tons | -77.24% |
| 2010 | 22423 | Metric tons | 56.98% |
| 2011 | 12270 | Metric tons | -45.28% |
| 2012 | 131843 | Metric tons | 974.52% |
| 2013 | 20000 | Metric tons | -84.83% |
