Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1115.09997558594 | Thousand metric tons of contained nitrogen | NA |
| 2004 | 1087.69995117188 | Thousand metric tons of contained nitrogen | -2.46% |
| 2005 | 1020 | Thousand metric tons of contained nitrogen | -6.22% |
| 2006 | 1020 | Thousand metric tons of contained nitrogen | 0.00% |
| 2007 | 2000 | Thousand metric tons of contained nitrogen | 96.08% |
| 2008 | 2000 | Thousand metric tons of contained nitrogen | 0.00% |
| 2009 | 2000 | Thousand metric tons of contained nitrogen | 0.00% |
| 2010 | 2500 | Thousand metric tons of contained nitrogen | 25.00% |
| 2011 | 2500 | Thousand metric tons of contained nitrogen | 0.00% |
| 2012 | 2500 | Thousand metric tons of contained nitrogen | 0.00% |
