Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 7 | Metric tons | NA |
| 2003 | 10 | Metric tons | 42.86% |
| 2004 | 9 | Metric tons | -10.00% |
| 2005 | 7.14200019836426 | Metric tons | -20.64% |
| 2006 | 8.39900016784668 | Metric tons | 17.60% |
| 2007 | 9.76500034332275 | Metric tons | 16.26% |
| 2008 | 9.16199970245361 | Metric tons | -6.18% |
| 2009 | 10.8269996643066 | Metric tons | 18.17% |
| 2010 | 15.3000001907349 | Metric tons | 41.31% |
| 2011 | 24.0450000762939 | Metric tons | 57.16% |
| 2012 | 8.62600040435791 | Metric tons | -64.13% |
