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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $182,817 | $9,180 | $9,370 | $1,066 | | $8,109 | $1,028 |
| Electrical insulators, of ceramics | $447 | $1,928 | | | | | |
| Electrical insulators of any mat. other than glass & ceramics | $74,882 | $20,626 | $13,277 | $112,954 | $23,661 | $802 | $118,488 |
| Total | $258,146 | $31,734 | $22,647 | $114,020 | $23,661 | $8,911 | $119,516 |
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