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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $2,440,011 | $2,714,620 | $2,695,768 | $3,399,911 | $2,975,754 | $2,750,450 | $3,289,446 |
| Total | $2,440,011 | $2,714,620 | $2,695,768 | $3,399,911 | $2,975,754 | $2,750,450 | $3,289,446 |
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