Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 114870 | Metric tons | NA |
| 2004 | 101896 | Metric tons | -11.29 % |
| 2005 | 64827 | Metric tons | -36.38 % |
| 2006 | 9834 | Metric tons | -84.83 % |
| 2007 | 9800 | Metric tons | -0.35 % |
| 2008 | 32410 | Metric tons | 230.71 % |
| 2009 | 32400 | Metric tons | -0.03 % |
