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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $14,380,142 | $19,179,622 | $17,013,715 | $14,437,943 | $9,552,389 | $12,840,470 | $14,998,626 |
| Total | $14,380,142 | $19,179,622 | $17,013,715 | $14,437,943 | $9,552,389 | $12,840,470 | $14,998,626 |
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