Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1090 | Metric tons | NA |
| 2004 | 1129.58996582031 | Metric tons | 3.63% |
| 2005 | 1573.81799316406 | Metric tons | 39.33% |
