Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2003 | 146845 | Metric tons | NA |
2004 | 163028 | Metric tons | 11.02% |
2005 | 247101 | Metric tons | 51.57% |
2006 | 246165 | Metric tons | -0.38% |
2007 | 250260 | Metric tons | 1.66% |
2008 | 256182 | Metric tons | 2.37% |
2009 | 148099 | Metric tons | -42.19% |
2010 | 229301 | Metric tons | 54.83% |
2011 | 228357 | Metric tons | -0.41% |
2012 | 193795 | Metric tons | -15.14% |
2013 | 200000 | Metric tons | 3.20% |