Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 5 | Metric tons | NA |
| 2003 | 5 | Metric tons | 0.00% |
| 2004 | 5 | Metric tons | 0.00% |
| 2005 | 5 | Metric tons | 0.00% |
| 2006 | 5 | Metric tons | 0.00% |
| 2007 | 5 | Metric tons | 0.00% |
| 2008 | 3.10999989509583 | Metric tons | -37.80% |
| 2009 | 1.26800000667572 | Metric tons | -59.23% |
| 2010 | 2.65199995040894 | Metric tons | 109.15% |
| 2011 | 1.76400005817413 | Metric tons | -33.48% |
| 2012 | 1.76699995994568 | Metric tons | 0.17% |
