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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $11,236,537 | $16,635,219 | $23,284,485 | $30,883,289 | $28,212,611 | $28,774,384 |
| Total | $11,236,537 | $16,635,219 | $23,284,485 | $30,883,289 | $28,212,611 | $28,774,384 |
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