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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $41 | $5,650 | $301 | $26 | $4,643,257 | $6,635 | $4,109,845 |
| Electrical insulators, of ceramics | $4,589,232 | $15,253,172 | $18,298,367 | $21,650,433 | $12,989,930 | $14,475,685 | $21,253,210 |
| Electrical insulators of any mat. other than glass & ceramics | $493,586 | $1,277,780 | $2,179,456 | $3,147,521 | $3,761,620 | $4,468,390 | $4,655,792 |
| Total | $5,082,859 | $16,536,602 | $20,478,124 | $24,797,980 | $21,394,807 | $18,950,710 | $30,018,847 |
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