Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 574 | Metric tons | NA |
| 2003 | 218 | Metric tons | -62.02% |
| 2004 | 220 | Metric tons | 0.92% |
| 2005 | 243 | Metric tons | 10.45% |
| 2006 | 25 | Metric tons | -89.71% |
| 2007 | 41 | Metric tons | 64.00% |
| 2008 | 29 | Metric tons | -29.27% |
| 2009 | 34 | Metric tons | 17.24% |
| 2010 | 22 | Metric tons | -35.29% |
| 2011 | 39 | Metric tons | 77.27% |
| 2012 | 30 | Metric tons | -23.08% |
| 2013 | 40 | Metric tons | 33.33% |
