Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 388 | Metric tons | NA |
| 2004 | 248 | Metric tons | -36.08% |
| 2005 | 274 | Metric tons | 10.48% |
| 2006 | 431 | Metric tons | 57.30% |
| 2007 | 1612 | Metric tons | 274.01% |
| 2008 | 1680 | Metric tons | 4.22% |
| 2009 | 985 | Metric tons | -41.37% |
| 2009 | 1400 | Metric tons | 42.13% |
| 2010 | 1500 | Metric tons | 7.14% |
| 2011 | 1600 | Metric tons | 6.67% |
| 2012 | 1600 | Metric tons | 0.00% |
| 2013 | 1500 | Metric tons | -6.25% |
