Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 180 | Metric tons | NA |
| 2004 | 200 | Metric tons | 11.11% |
| 2005 | 370 | Metric tons | 85.00% |
| 2006 | 400 | Metric tons | 8.11% |
| 2007 | 370 | Metric tons | -7.50% |
| 2008 | 340000 | Kilograms | 91,791.89% |
| 2008 | 340 | Metric tons | -99.90% |
| 2009 | 340000 | Kilograms | 99,900.00% |
| 2009 | 280 | Metric tons | -99.92% |
| 2010 | 330000 | Kilograms | 117,757.10% |
| 2011 | 380000 | Kilograms | 15.15% |
| 2012 | 405000 | Kilograms | 6.58% |
