Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 5770 | Metric tons | NA |
| 2004 | 6449 | Metric tons | 11.77% |
| 2005 | 9000 | Metric tons | 39.56% |
| 2006 | 6600 | Metric tons | -26.67% |
| 2007 | 54000 | Metric tons | 718.18% |
| 2008 | 50000 | Metric tons | -7.41% |
| 2009 | 2839 | Metric tons | -94.32% |
| 2010 | 2567 | Metric tons | -9.58% |
| 2011 | 17308 | Metric tons | 574.25% |
| 2012 | 1392 | Metric tons | -91.96% |
| 2013 | 1400 | Metric tons | 0.57% |
