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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $6,527,032 | $5,736,603 | $14,874,823 | $19,111,984 | $15,377,218 | $11,541,641 | $20,324,642 |
| Electrical insulators, of ceramics | $91,828,621 | $116,248,325 | $109,744,231 | $126,876,825 | $104,747,866 | $110,623,504 | $132,765,158 |
| Electrical insulators of any mat. other than glass & ceramics | $72,946,156 | $87,638,540 | $80,870,730 | $97,758,154 | $96,509,589 | $129,365,999 | $148,053,134 |
| Total | $171,301,809 | $209,623,468 | $205,489,784 | $243,746,963 | $216,634,673 | $251,531,144 | $301,142,934 |
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