Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 2137 | Thousand metric tons | NA |
2003 | 2100 | Thousand metric tons | -1.73% |
2004 | 2938.8701171875 | Thousand metric tons | 39.95% |
2005 | 3618.22094726563 | Thousand metric tons | 23.12% |
2006 | 4092.69189453125 | Thousand metric tons | 13.11% |
2007 | 4413.34619140625 | Thousand metric tons | 7.83% |
2008 | 4651 | Thousand metric tons | 5.38% |
2009 | 2645 | Thousand metric tons | -43.13% |
2010 | 1961 | Thousand metric tons | -25.86% |
2011 | 1866 | Thousand metric tons | -4.84% |
2012 | 2000 | Thousand metric tons | 7.18% |