Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 67 | Thousand metric tons | NA |
| 2003 | 129 | Thousand metric tons | 92.54% |
| 2004 | 400 | Thousand metric tons | 210.08% |
| 2005 | 400 | Thousand metric tons | 0.00% |
| 2006 | 400 | Thousand metric tons | 0.00% |
| 2007 | 400 | Thousand metric tons | 0.00% |
| 2008 | 438 | Thousand metric tons | 9.50% |
| 2009 | 700 | Thousand metric tons | 59.82% |
| 2010 | 900 | Thousand metric tons | 28.57% |
| 2011 | 1200 | Thousand metric tons | 33.33% |
| 2012 | 1300 | Thousand metric tons | 8.33% |
