Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 161.100006103516 | Thousand metric tons of contained nitrogen | NA |
| 2004 | 115.199996948242 | Thousand metric tons of contained nitrogen | -28.49 % |
| 2005 | 120 | Thousand metric tons of contained nitrogen | 4.17 % |
| 2006 | 120 | Thousand metric tons of contained nitrogen | 0.00 % |
| 2007 | 120 | Thousand metric tons of contained nitrogen | 0.00 % |
| 2008 | 120 | Thousand metric tons of contained nitrogen | 0.00 % |
| 2009 | 210 | Thousand metric tons of contained nitrogen | 75.00 % |
