Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 240 | Metric tons of rare earth oxide equivalent | NA |
| 2004 | 800 | Metric tons of rare earth oxide equivalent | 233.33% |
| 2005 | 150 | Metric tons of rare earth oxide equivalent | -81.25% |
| 2006 | 430 | Metric tons of rare earth oxide equivalent | 186.67% |
| 2007 | 380 | Metric tons of rare earth oxide equivalent | -11.63% |
| 2008 | 120 | Metric tons of rare earth oxide equivalent | -68.42% |
| 2009 | 13 | Metric tons of rare earth oxide equivalent | -89.17% |
| 2010 | 380 | Metric tons of rare earth oxide equivalent | 2,823.08% |
| 2011 | 410 | Metric tons of rare earth oxide equivalent | 7.89% |
| 2012 | 100 | Metric tons of rare earth oxide equivalent | -75.61% |
