Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 7017 | Metric tons | NA |
| 2003 | 3864 | Metric tons | -44.93 % |
| 2004 | 1196 | Metric tons | -69.05 % |
| 2005 | 2819 | Metric tons | 135.70 % |
| 2006 | 1478 | Metric tons | -47.57 % |
| 2007 | 2071 | Metric tons | 40.12 % |
| 2008 | 1783 | Metric tons | -13.91 % |
| 2009 | 1400 | Metric tons | -21.48 % |
