Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 456 | Metric tons | NA |
| 2003 | 606 | Metric tons | 32.89% |
| 2004 | 526 | Metric tons | -13.20% |
| 2005 | 708 | Metric tons | 34.60% |
| 2006 | 923 | Metric tons | 30.37% |
| 2007 | 830 | Metric tons | -10.08% |
| 2008 | 741 | Metric tons | -10.72% |
| 2009 | 1000 | Metric tons | 34.95% |
| 2010 | 4000 | Metric tons | 300.00% |
| 2011 | 11000 | Metric tons | 175.00% |
| 2012 | 10600 | Metric tons | -3.64% |
| 2013 | 11000 | Metric tons | 3.77% |
