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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $774,635 | $902,385 | $1,340,727 | $2,387,585 | $2,264,241 | $625,947 | $1,571,795 |
| Electrical insulators, of ceramics | $13,799,300 | $14,061,560 | $20,920,232 | $33,973,012 | $25,177,462 | $23,497,971 | $20,614,639 |
| Electrical insulators of any mat. other than glass & ceramics | $8,716,687 | $8,935,544 | $8,378,540 | $7,704,037 | $7,831,323 | $7,319,916 | $8,950,982 |
| Total | $23,290,622 | $23,899,489 | $30,639,499 | $44,064,634 | $35,273,026 | $31,443,834 | $31,137,416 |
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