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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $230,159 | $220,399 | $1,608,230 | $780,506 | $789,436 | $2,266,493 | $1,061,540 |
| Electrical insulators, of ceramics | $8,881,339 | $9,485,466 | $9,294,264 | $10,204,227 | $14,847,742 | $15,283,164 | $15,065,505 |
| Electrical insulators of any mat. other than glass & ceramics | $15,850,933 | $16,928,329 | $22,741,841 | $24,857,713 | $16,088,364 | $20,170,512 | $23,177,392 |
| Total | $24,962,431 | $26,634,194 | $33,644,335 | $35,842,446 | $31,725,542 | $37,720,169 | $39,304,437 |
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