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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $604,040 | $1,000,612 | $665,832 | $526,656 | $410,746 | $227,350 | $527,121 |
| Total | $604,040 | $1,000,612 | $665,832 | $526,656 | $410,746 | $227,350 | $527,121 |
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