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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Slates & boards, with writing/drawing surfaces, whether or not framed | $478,891 | $461,910 | $948,852 | $1,133,167 | $780,216 | $662,126 | $334,226 |
| Total | $478,891 | $461,910 | $948,852 | $1,133,167 | $780,216 | $662,126 | $334,226 |
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