Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1585 | Metric tons | NA |
| 2004 | 2863 | Metric tons | 80.63% |
| 2005 | 1631 | Metric tons | -43.03% |
| 2006 | 526 | Metric tons | -67.75% |
| 2007 | 1291 | Metric tons | 145.44% |
| 2008 | 1030 | Metric tons | -20.22% |
| 2009 | 6355 | Metric tons | 516.99% |
| 2010 | 2175 | Metric tons | -65.77% |
| 2011 | 8187 | Metric tons | 276.41% |
| 2012 | 2311 | Metric tons | -71.77% |
| 2013 | 5000 | Metric tons | 116.36% |
