Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 20 | Metric tons | NA |
| 2003 | 72 | Metric tons | 260.00 % |
| 2004 | 62 | Metric tons | -13.89 % |
| 2005 | 44 | Metric tons | -29.03 % |
| 2006 | 155 | Metric tons | 252.27 % |
| 2007 | 147 | Metric tons | -5.16 % |
| 2008 | 28 | Metric tons | -80.95 % |
| 2009 | 54 | Metric tons | 92.86 % |
| 2010 | 87 | Metric tons | 61.11 % |
| 2011 | 41 | Metric tons | -52.87 % |
| 2012 | 10 | Metric tons | -75.61 % |
