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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $1,279,618 | $363,682 | $2,674,222 | $1,174,726 | $926,438 | $1,291,035 | $1,955,713 |
| Electrical insulators, of ceramics | $1,141,514 | $792,815 | $731,490 | $1,337,143 | $871,269 | $2,066,818 | $1,850,313 |
| Electrical insulators of any mat. other than glass & ceramics | $4,180,850 | $3,582,954 | $3,823,689 | $3,748,227 | $4,163,886 | $3,884,459 | $4,653,500 |
| Total | $6,601,982 | $4,739,451 | $7,229,401 | $6,260,096 | $5,961,593 | $7,242,312 | $8,459,526 |
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