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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $11,720 | $16,053 | $548 | $18,415 | $228 | | $3,912 |
| Electrical insulators, of ceramics | $156,511 | $75,944 | $58,854 | $115,261 | $90,527 | $24,510 | $27,399 |
| Electrical insulators of any mat. other than glass & ceramics | $119,461 | $53,567 | $54,740 | $171,566 | $38,350 | $91,195 | $9,570 |
| Total | $287,692 | $145,564 | $114,142 | $305,242 | $129,105 | $115,705 | $40,881 |
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