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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Worked slate & arts. of slate/agglom. slate | $46,285,774 | $48,242,589 | $63,912,662 | $33,802,468 | $15,818,255 | $11,591,785 | $14,512,195 |
| Total | $46,285,774 | $48,242,589 | $63,912,662 | $33,802,468 | $15,818,255 | $11,591,785 | $14,512,195 |
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