Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1185.30004882813 | Thousand metric tons of contained nitrogen | NA |
| 2004 | 1428 | Thousand metric tons of contained nitrogen | 20.48% |
| 2005 | 1753.98400878906 | Thousand metric tons of contained nitrogen | 22.83% |
| 2006 | 1784 | Thousand metric tons of contained nitrogen | 1.71% |
| 2007 | 1800 | Thousand metric tons of contained nitrogen | 0.90% |
| 2008 | 1812 | Thousand metric tons of contained nitrogen | 0.67% |
| 2009 | 1828 | Thousand metric tons of contained nitrogen | 0.88% |
| 2010 | 1883 | Thousand metric tons of contained nitrogen | 3.01% |
| 2011 | 1919 | Thousand metric tons of contained nitrogen | 1.91% |
| 2012 | 2665 | Thousand metric tons of contained nitrogen | 38.87% |
