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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $320,511 | $536,736 | $1,011,647 | $561,167 | $368,302 | $130,338 | $284,149 |
| Electrical insulators, of ceramics | $1,525,517 | $1,475,196 | $2,940,701 | $3,344,419 | $2,072,902 | $1,903,728 | $2,707,702 |
| Electrical insulators of any mat. other than glass & ceramics | $1,097,138 | $1,306,598 | $1,747,481 | $1,554,441 | $3,135,214 | $1,493,542 | $1,877,377 |
| Total | $2,943,166 | $3,318,530 | $5,699,829 | $5,460,027 | $5,576,418 | $3,527,608 | $4,869,228 |
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