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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $1,739,838 | $1,132,101 | $1,827,805 | $1,470,888 | $1,297,275 | $1,737,439 | $2,160,736 |
| Total | $1,739,838 | $1,132,101 | $1,827,805 | $1,470,888 | $1,297,275 | $1,737,439 | $2,160,736 |
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