Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 550 | Metric tons | NA |
| 2004 | 600 | Metric tons | 9.09% |
| 2005 | 1955 | Metric tons | 225.83% |
| 2006 | 1025 | Metric tons | -47.57% |
| 2007 | 1775 | Metric tons | 73.17% |
| 2008 | 977 | Metric tons | -44.96% |
| 2009 | 682 | Metric tons | -30.19% |
| 2010 | 1292 | Metric tons | 89.44% |
| 2011 | 547 | Metric tons | -57.66% |
| 2012 | 286 | Metric tons | -47.71% |
| 2013 | 300 | Metric tons | 4.90% |
