Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 1040 | Thousand metric tons of K | NA |
| 2004 | 547.200012207031 | Thousand metric tons of K | -47.38% |
| 2005 | 439.200012207031 | Thousand metric tons of K | -19.74% |
| 2006 | 420 | Thousand metric tons of K | -4.37% |
| 2007 | 427 | Thousand metric tons of K | 1.67% |
| 2008 | 410.529998779297 | Thousand metric tons of K | -3.86% |
| 2009 | 411 | Thousand metric tons of K | 0.11% |
| 2010 | 427 | Thousand metric tons of K | 3.89% |
| 2011 | 469.700012207031 | Thousand metric tons of K | 10.00% |
| 2012 | 470 | Thousand metric tons of K | 0.06% |
