Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 3720 | Metric tons | NA |
| 2004 | 3560 | Metric tons | -4.30% |
| 2005 | 1000 | Metric tons | -71.91% |
| 2006 | 1000 | Metric tons | 0.00% |
| 2007 | 1148 | Metric tons | 14.80% |
| 2008 | 1422 | Metric tons | 23.87% |
| 2009 | 1413 | Metric tons | -0.63% |
| 2010 | 1475 | Metric tons | 4.39% |
| 2011 | 2087 | Metric tons | 41.49% |
| 2012 | 2000 | Metric tons | -4.17% |
| 2013 | 2000 | Metric tons | 0.00% |
