Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 594.35498046875 | Thousand metric tons of K | NA |
| 2004 | 590 | Thousand metric tons of K | -0.73% |
| 2005 | 575 | Thousand metric tons of K | -2.54% |
| 2006 | 435.191009521484 | Thousand metric tons of K | -24.31% |
| 2007 | 435 | Thousand metric tons of K | -0.04% |
| 2008 | 435 | Thousand metric tons of K | 0.00% |
| 2009 | 481.454986572266 | Thousand metric tons of K | 10.68% |
| 2010 | 418.778015136719 | Thousand metric tons of K | -13.02% |
| 2011 | 436.026000976563 | Thousand metric tons of K | 4.12% |
| 2012 | 436 | Thousand metric tons of K | -0.01% |
