Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 23.2390003204346 | Thousand metric tons | NA |
| 2005 | 0.898999989032745 | Thousand metric tons | -96.13% |
| 2006 | 0.899999976158142 | Thousand metric tons | 0.11% |
