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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $543,275 | $707,817 | $557,308 | $202,743 | $515,256 | $203,359 | $411,466 |
| Electrical insulators, of ceramics | $2,752,837 | $2,828,352 | $2,126,233 | $2,879,186 | $1,321,541 | $1,142,533 | $975,855 |
| Electrical insulators of any mat. other than glass & ceramics | $1,561,655 | $3,327,616 | $3,954,442 | $4,741,568 | $4,259,407 | $2,934,903 | $3,543,633 |
| Total | $4,857,767 | $6,863,785 | $6,637,983 | $7,823,497 | $6,096,204 | $4,280,795 | $4,930,954 |
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