Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 130000 | Thousand metric tons | NA |
| 2004 | 140000 | Thousand metric tons | 7.69% |
| 2005 | 150000 | Thousand metric tons | 7.14% |
| 2006 | 160000 | Thousand metric tons | 6.67% |
| 2007 | 170000 | Thousand metric tons | 6.25% |
| 2008 | 180000 | Thousand metric tons | 5.88% |
| 2009 | 185000 | Thousand metric tons | 2.78% |
| 2010 | 190000 | Thousand metric tons | 2.70% |
| 2011 | 200000 | Thousand metric tons | 5.26% |
| 2012 | 220000 | Thousand metric tons | 10.00% |
| 2013 | 230000 | Thousand metric tons | 4.55% |
