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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $3,224,307 | $3,575,901 | $4,927,069 | $7,030,233 | $4,184,295 | $4,960,709 | $6,764,221 |
| Electrical insulators, of ceramics | $2,318,215 | $4,531,397 | $3,748,611 | $4,526,472 | $2,499,120 | $2,560,329 | $3,069,909 |
| Electrical insulators of any mat. other than glass & ceramics | $19,800,773 | $17,695,860 | $18,964,603 | $20,215,366 | $17,159,280 | $13,797,713 | $15,316,436 |
| Total | $25,343,295 | $25,803,158 | $27,640,283 | $31,772,071 | $23,842,695 | $21,318,751 | $25,150,566 |
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