Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1194 | Thousand metric tons of K | NA |
| 2004 | 1180 | Thousand metric tons of K | -1.17 % |
| 2005 | 1115 | Thousand metric tons of K | -5.51 % |
| 2006 | 1036 | Thousand metric tons of K | -7.09 % |
| 2007 | 1096 | Thousand metric tons of K | 5.79 % |
| 2008 | 1223 | Thousand metric tons of K | 11.59 % |
