Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 2 | Metric tons | NA |
| 2003 | 1 | Metric tons | -50.00% |
| 2004 | 3 | Metric tons | 200.00% |
| 2005 | 3.40000009536743 | Metric tons | 13.33% |
| 2006 | 1 | Metric tons | -70.59% |
| 2007 | 1.10000002384186 | Metric tons | 10.00% |
| 2008 | 1.10000002384186 | Metric tons | 0.00% |
| 2009 | 1.20000004768372 | Metric tons | 9.09% |
| 2011 | 0.550000011920929 | Metric tons | -54.17% |
| 2012 | 0.600000023841858 | Metric tons | 9.09% |
