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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Worked slate & arts. of slate/agglom. slate | $29,174,214 | $32,387,435 | $36,873,705 | $38,015,356 | $32,299,997 | $32,759,581 | $35,929,477 |
| Total | $29,174,214 | $32,387,435 | $36,873,705 | $38,015,356 | $32,299,997 | $32,759,581 | $35,929,477 |
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