Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 629 | Metric tons | NA |
| 2004 | 532 | Metric tons | -15.42% |
| 2005 | 621 | Metric tons | 16.73% |
| 2006 | 690 | Metric tons | 11.11% |
| 2007 | 810 | Metric tons | 17.39% |
| 2008 | 800 | Metric tons | -1.23% |
| 2009 | 1100 | Metric tons | 37.50% |
| 2010 | 1200 | Metric tons | 9.09% |
| 2011 | 1600 | Metric tons | 33.33% |
| 2012 | 1500 | Metric tons | -6.25% |
| 2013 | 1200 | Metric tons | -20.00% |
