Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2004 | 402 | Metric tons of rare earth oxide equivalent | NA |
| 2005 | 527 | Metric tons of rare earth oxide equivalent | 31.09% |
| 2006 | 527 | Metric tons of rare earth oxide equivalent | 0.00% |
| 2007 | 645 | Metric tons of rare earth oxide equivalent | 22.39% |
| 2008 | 460 | Metric tons of rare earth oxide equivalent | -28.68% |
| 2009 | 170 | Metric tons of rare earth oxide equivalent | -63.04% |
| 2010 | 140 | Metric tons of rare earth oxide equivalent | -17.65% |
| 2011 | 160 | Metric tons of rare earth oxide equivalent | 14.29% |
| 2012 | 206 | Metric tons of rare earth oxide equivalent | 28.75% |
