Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 563 | Thousand metric tons of K | NA |
| 2004 | 559 | Thousand metric tons of K | -0.71% |
| 2005 | 547 | Thousand metric tons of K | -2.15% |
| 2006 | 496 | Thousand metric tons of K | -9.32% |
| 2007 | 515.299987792969 | Thousand metric tons of K | 3.89% |
| 2008 | 559.299987792969 | Thousand metric tons of K | 8.54% |
| 2009 | 691.299987792969 | Thousand metric tons of K | 23.60% |
| 2010 | 963.599975585938 | Thousand metric tons of K | 39.39% |
| 2011 | 861.200012207031 | Thousand metric tons of K | -10.63% |
| 2012 | 1053 | Thousand metric tons of K | 22.27% |
