Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 2 | Metric tons | NA |
| 2003 | 36 | Metric tons | 1,700.00% |
| 2004 | 33 | Metric tons | -8.33% |
| 2005 | 53.5530014038086 | Metric tons | 62.28% |
| 2006 | 67.6330032348633 | Metric tons | 26.29% |
| 2007 | 76.2429962158203 | Metric tons | 12.73% |
| 2008 | 34.0830001831055 | Metric tons | -55.30% |
| 2010 | 6.44600009918213 | Metric tons | -81.09% |
| 2011 | 10.0799999237061 | Metric tons | 56.38% |
| 2012 | 12.3409996032715 | Metric tons | 22.43% |
