Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 415.549011230469 | Thousand metric tons of K | NA |
| 2004 | 403.079986572266 | Thousand metric tons of K | -3.00% |
| 2005 | 404.871002197266 | Thousand metric tons of K | 0.44% |
| 2006 | 403.079986572266 | Thousand metric tons of K | -0.44% |
| 2007 | 471.3330078125 | Thousand metric tons of K | 16.93% |
| 2008 | 383.256988525391 | Thousand metric tons of K | -18.69% |
| 2009 | 452.697998046875 | Thousand metric tons of K | 18.12% |
| 2010 | 447.899993896484 | Thousand metric tons of K | -1.06% |
| 2011 | 423.850006103516 | Thousand metric tons of K | -5.37% |
| 2012 | 425 | Thousand metric tons of K | 0.27% |
