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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $328 | $21,560 | $7,396 | $231,309 | $500 | $164,810 | $229,710 |
| Electrical insulators, of ceramics | $591,044 | $550,941 | $10,945 | $718,316 | $144,492 | $688,895 | $367,518 |
| Electrical insulators of any mat. other than glass & ceramics | $1,558,204 | $520,079 | $1,071,102 | $1,926,323 | $1,192,381 | $1,635,010 | $4,408,481 |
| Total | $2,149,576 | $1,092,580 | $1,089,443 | $2,875,948 | $1,337,373 | $2,488,715 | $5,005,709 |
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