Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 4230 | Thousand metric tons of K | NA |
| 2004 | 4600 | Thousand metric tons of K | 8.75 % |
| 2005 | 4844 | Thousand metric tons of K | 5.30 % |
| 2006 | 4605 | Thousand metric tons of K | -4.93 % |
| 2007 | 4972 | Thousand metric tons of K | 7.97 % |
| 2008 | 4967.5 | Thousand metric tons of K | -0.09 % |
