Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 642 | Metric tons | NA |
| 2004 | 561 | Metric tons | -12.62% |
| 2005 | 732 | Metric tons | 30.48% |
| 2006 | 720 | Metric tons | -1.64% |
| 2007 | 1129 | Metric tons | 56.81% |
| 2008 | 1100 | Metric tons | -2.57% |
| 2009 | 38000 | Metric tons | 3,354.55% |
| 2010 | 1397 | Metric tons | -96.32% |
| 2011 | 835 | Metric tons | -40.23% |
| 2012 | 4987 | Metric tons | 497.25% |
| 2013 | 5000 | Metric tons | 0.26% |
