Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1351 | Metric tons | NA |
| 2004 | 1900 | Metric tons | 40.64% |
| 2005 | 2000 | Metric tons | 5.26% |
| 2006 | 2000 | Metric tons | 0.00% |
| 2007 | 2100 | Metric tons | 5.00% |
| 2008 | 2100 | Metric tons | 0.00% |
| 2009 | 1300 | Metric tons | -38.10% |
| 2010 | 1400 | Metric tons | 7.69% |
| 2011 | 1300 | Metric tons | -7.14% |
| 2012 | 1200 | Metric tons | -7.69% |
| 2013 | 1200 | Metric tons | 0.00% |
