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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $169 | $295 | $3,844 | $10,324 | $13,915 | $5,844 | $251,068 |
| Electrical insulators, of ceramics | $11,734,643 | $10,806,871 | $12,489,506 | $13,813,869 | $14,472,656 | $14,299,304 | $8,698,890 |
| Electrical insulators of any mat. other than glass & ceramics | $7,792,848 | $9,562,012 | $11,113,174 | $14,779,839 | $13,937,707 | $15,175,869 | $21,072,755 |
| Total | $19,527,660 | $20,369,178 | $23,606,524 | $28,604,032 | $28,424,278 | $29,481,017 | $30,022,713 |
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