Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 29 | Metric tons | NA |
| 2003 | 31 | Metric tons | 6.90 % |
| 2004 | 37 | Metric tons | 19.35 % |
| 2005 | 49.2000007629395 | Metric tons | 32.97 % |
| 2006 | 50 | Metric tons | 1.63 % |
| 2007 | 50 | Metric tons | 0.00 % |
| 2008 | 69.7060012817383 | Metric tons | 39.41 % |
| 2009 | 70 | Metric tons | 0.42 % |
