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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $51,319 | $48,609 | $198,292 | $560,829 | $221,959 | $311,647 | $43,894 |
| Electrical insulators, of ceramics | $2,767,152 | $2,651,342 | $3,063,736 | $1,877,544 | $2,638,011 | $3,914,208 | $4,649,938 |
| Electrical insulators of any mat. other than glass & ceramics | $670,792 | $492,579 | $898,460 | $1,801,959 | $960,252 | $1,708,075 | $2,200,979 |
| Total | $3,489,263 | $3,192,530 | $4,160,488 | $4,240,332 | $3,820,222 | $5,933,930 | $6,894,811 |
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