Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 53 | Metric tons | NA |
| 2003 | 51 | Metric tons | -3.77 % |
| 2004 | 48 | Metric tons | -5.88 % |
| 2005 | 53.617000579834 | Metric tons | 11.70 % |
| 2006 | 55.0359992980957 | Metric tons | 2.65 % |
| 2007 | 50 | Metric tons | -9.15 % |
| 2008 | 12 | Metric tons | -76.00 % |
| 2009 | 15 | Metric tons | 25.00 % |
