Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 400 | Metric tons | NA |
| 2003 | 700 | Metric tons | 75.00% |
| 2004 | 1277 | Metric tons | 82.43% |
| 2005 | 1350 | Metric tons | 5.72% |
| 2006 | 1250 | Metric tons | -7.41% |
| 2007 | 1200 | Metric tons | -4.00% |
| 2008 | 1132.166015625 | Metric tons | -5.65% |
| 2009 | 1312.56701660156 | Metric tons | 15.93% |
| 2010 | 1356 | Metric tons | 3.31% |
| 2011 | 1350 | Metric tons | -0.44% |
| 2012 | 1500 | Metric tons | 11.11% |
