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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $95,997 | $238,875 | $2,838,637 | $2,085,056 | $97,125 | $253,033 | $472,650 |
| Electrical insulators, of ceramics | $109,233,449 | $99,173,726 | $137,338,097 | $132,245,354 | $143,955,144 | $120,643,346 | $105,023,275 |
| Electrical insulators of any mat. other than glass & ceramics | $1,381,539 | $1,962,887 | $1,904,258 | $3,137,296 | $6,820,704 | $7,525,232 | $5,603,439 |
| Total | $110,710,985 | $101,375,488 | $142,080,992 | $137,467,706 | $150,872,973 | $128,421,611 | $111,099,364 |
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