Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 77 | Kilograms | NA |
| 2003 | 79 | Kilograms | 2.60 % |
| 2004 | 107 | Kilograms | 35.44 % |
| 2005 | 109 | Kilograms | 1.87 % |
| 2006 | 84 | Kilograms | -22.94 % |
| 2007 | 92 | Kilograms | 9.52 % |
| 2008 | 198 | Kilograms | 115.22 % |
| 2009 | 200 | Kilograms | 1.01 % |
