Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 2845 | Metric tons | NA |
| 2003 | 5500 | Metric tons | 93.32% |
| 2004 | 7032 | Metric tons | 27.85% |
| 2005 | 7000 | Metric tons | -0.46% |
| 2006 | 7000 | Metric tons | 0.00% |
| 2007 | 1800 | Metric tons | -74.29% |
| 2008 | 1800 | Metric tons | 0.00% |
| 2009 | 6797 | Metric tons | 277.61% |
| 2010 | 2860 | Metric tons | -57.92% |
| 2011 | 7130 | Metric tons | 149.30% |
| 2012 | 7000 | Metric tons | -1.82% |
| 2013 | 5000 | Metric tons | -28.57% |
