Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 4850 | Metric tons | NA |
| 2004 | 2224 | Metric tons | -54.14% |
| 2005 | 2058 | Metric tons | -7.46% |
| 2006 | 2930 | Metric tons | 42.37% |
| 2007 | 6813 | Metric tons | 132.53% |
| 2008 | 5679 | Metric tons | -16.64% |
| 2009 | 7623 | Metric tons | 34.23% |
| 2010 | 8975 | Metric tons | 17.74% |
| 2011 | 30000 | Metric tons | 234.26% |
| 2012 | 30000 | Metric tons | 0.00% |
