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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $1,252,523 | $53,397 | $105,553 | $536,190 | $252,747 | $347,501 |
| Electrical insulators, of ceramics | $4,943,641 | $1,647,516 | $2,862,190 | $2,466,358 | $2,929,237 | $3,404,707 |
| Electrical insulators of any mat. other than glass & ceramics | $2,040,707 | $4,866,403 | $4,442,938 | $3,320,956 | $4,584,468 | $4,822,928 |
| Total | $8,236,871 | $6,567,316 | $7,410,681 | $6,323,504 | $7,766,452 | $8,575,136 |
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