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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $3,227,651 | $2,464,467 | $2,002,035 | $2,092,331 | $3,167,726 | $2,226,020 |
| Electrical insulators, of ceramics | $16,411,551 | $20,928,784 | $28,056,622 | $28,424,934 | $22,082,274 | $7,143,242 |
| Electrical insulators of any mat. other than glass & ceramics | $21,398,676 | $25,398,973 | $30,061,543 | $41,477,532 | $25,320,470 | $25,931,332 |
| Total | $41,037,878 | $48,792,224 | $60,120,200 | $71,994,797 | $50,570,470 | $35,300,594 |
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