Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 1 | Metric tons | NA |
| 2003 | 1 | Metric tons | 0.00% |
| 2004 | 1 | Metric tons | 0.00% |
| 2005 | 0.885999977588654 | Metric tons | -11.40% |
| 2006 | 0.90200001001358 | Metric tons | 1.81% |
| 2007 | 0.707000017166138 | Metric tons | -21.62% |
| 2008 | 2.71399998664856 | Metric tons | 283.88% |
| 2009 | 0.771000027656555 | Metric tons | -71.59% |
| 2010 | 2.40000009536743 | Metric tons | 211.28% |
| 2011 | 2.40000009536743 | Metric tons | 0.00% |
| 2012 | 2.40000009536743 | Metric tons | 0.00% |
