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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $85,020 | $94,932 | $128,296 | $91,773 | $143,774 | $81,490 | $81,870 |
| Electrical insulators, of ceramics | $16,927,843 | $20,690,438 | $14,089,331 | $10,978,663 | $12,820,975 | $12,169,170 | $20,194,992 |
| Electrical insulators of any mat. other than glass & ceramics | $34,069,322 | $38,335,951 | $62,433,575 | $96,247,700 | $97,965,245 | $82,838,045 | $94,417,124 |
| Total | $51,082,185 | $59,121,321 | $76,651,202 | $107,318,136 | $110,929,994 | $95,088,705 | $114,693,986 |
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