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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $856,600 | $730,100 | $1,004,500 | $1,412,400 | $362,200 | $394,800 | $564,100 |
| Total | $856,600 | $730,100 | $1,004,500 | $1,412,400 | $362,200 | $394,800 | $564,100 |
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