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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $10,886 | $26,617 | $16,320 | $240,843 | $149,543 | $1,021,362 | $1,358,367 |
| Electrical insulators, of ceramics | $1,678,594 | $1,987,809 | $1,912,385 | $1,433,561 | $1,602,894 | $1,632,636 | $2,267,498 |
| Electrical insulators of any mat. other than glass & ceramics | $3,807,699 | $2,452,096 | $2,953,312 | $3,117,530 | $4,542,475 | $3,264,228 | $6,720,265 |
| Total | $5,497,179 | $4,466,522 | $4,882,017 | $4,791,934 | $6,294,912 | $5,918,226 | $10,346,130 |
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