Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1450 | Metric tons | NA |
| 2004 | 1480 | Metric tons | 2.07 % |
| 2005 | 1470 | Metric tons | -0.68 % |
| 2006 | 723 | Metric tons | -50.82 % |
| 2007 | 735 | Metric tons | 1.66 % |
| 2008 | 777 | Metric tons | 5.71 % |
| 2009 | 633 | Metric tons | -18.53 % |
