Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 20 | Metric tons | NA |
| 2003 | 72 | Metric tons | 260.00% |
| 2004 | 62 | Metric tons | -13.89% |
| 2005 | 44 | Metric tons | -29.03% |
| 2006 | 155 | Metric tons | 252.27% |
| 2007 | 147 | Metric tons | -5.16% |
| 2008 | 28 | Metric tons | -80.95% |
| 2009 | 54 | Metric tons | 92.86% |
| 2010 | 87 | Metric tons | 61.11% |
| 2011 | 41 | Metric tons | -52.87% |
| 2012 | 10 | Metric tons | -75.61% |
