Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 102 | Metric tons | NA |
| 2003 | 70 | Metric tons | -31.37% |
| 2004 | 70 | Metric tons | 0.00% |
| 2005 | 546 | Metric tons | 680.00% |
| 2006 | 1071 | Metric tons | 96.15% |
| 2007 | 1349 | Metric tons | 25.96% |
| 2008 | 1233 | Metric tons | -8.60% |
| 2009 | 358 | Metric tons | -70.97% |
| 2010 | 2069 | Metric tons | 477.93% |
| 2011 | 3411 | Metric tons | 64.86% |
| 2012 | 12352 | Metric tons | 262.12% |
| 2013 | 9600 | Metric tons | -22.28% |
