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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $82,198 | $231,912 | $1,995 | $327,441 | | $550,676 | $49,085 |
| Electrical insulators, of ceramics | $952,777 | $1,313,680 | $1,284,443 | $920,196 | $765,028 | $591,082 | $1,322,341 |
| Electrical insulators of any mat. other than glass & ceramics | $1,156,747 | $748,383 | $1,591,489 | $860,692 | $1,037,676 | $1,028,112 | $1,477,423 |
| Total | $2,191,722 | $2,293,975 | $2,877,927 | $2,108,329 | $1,802,704 | $2,169,870 | $2,848,849 |
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