Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 7 | Metric tons | NA |
| 2003 | 12 | Metric tons | 71.43% |
| 2004 | 5 | Metric tons | -58.33% |
| 2005 | 3.51500010490417 | Metric tons | -29.70% |
| 2006 | 1.52100002765656 | Metric tons | -56.73% |
| 2007 | 1.39999997615814 | Metric tons | -7.96% |
| 2008 | 1.46200001239777 | Metric tons | 4.43% |
| 2009 | 1.5 | Metric tons | 2.60% |
| 2010 | 2.02500009536743 | Metric tons | 35.00% |
| 2011 | 2.6489999294281 | Metric tons | 30.81% |
| 2012 | 2.5 | Metric tons | -5.62% |
