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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $1,831,039 | $2,083,039 | $2,834,922 | $2,688,810 | $2,296,341 | $2,684,734 | $2,674,457 |
| Total | $1,831,039 | $2,083,039 | $2,834,922 | $2,688,810 | $2,296,341 | $2,684,734 | $2,674,457 |
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