Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 6 | Metric tons | NA |
| 2003 | 4 | Metric tons | -33.33% |
| 2004 | 4 | Metric tons | 0.00% |
| 2005 | 4 | Metric tons | 0.00% |
| 2006 | 4 | Metric tons | 0.00% |
| 2007 | 4 | Metric tons | 0.00% |
| 2008 | 40.4339981079102 | Metric tons | 910.85% |
| 2009 | 52.8759994506836 | Metric tons | 30.77% |
| 2010 | 68.4280014038086 | Metric tons | 29.41% |
| 2011 | 73 | Metric tons | 6.68% |
| 2012 | 75 | Metric tons | 2.74% |
