Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 52 | Metric tons | NA |
| 2003 | 51 | Metric tons | -1.92% |
| 2004 | 15 | Metric tons | -70.59% |
| 2005 | 31.5 | Metric tons | 110.00% |
| 2006 | 30.8999996185303 | Metric tons | -1.90% |
| 2007 | 82.3000030517578 | Metric tons | 166.34% |
| 2008 | 96 | Metric tons | 16.65% |
| 2009 | 138.100006103516 | Metric tons | 43.85% |
| 2010 | 165.100006103516 | Metric tons | 19.55% |
| 2011 | 203.5 | Metric tons | 23.26% |
| 2012 | 330 | Metric tons | 62.16% |
