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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $2,174,463 | $6,029,577 | $5,213,847 | $6,644,180 | $4,089,521 | $4,873,878 | $7,414,318 |
| Electrical insulators, of ceramics | $15,279,978 | $16,408,293 | $12,002,418 | $14,431,153 | $6,946,370 | $14,819,797 | $6,365,352 |
| Electrical insulators of any mat. other than glass & ceramics | $42,322,366 | $47,033,381 | $45,844,387 | $43,365,365 | $34,211,533 | $27,624,550 | $28,722,411 |
| Total | $59,776,807 | $69,471,251 | $63,060,652 | $64,440,698 | $45,247,424 | $47,318,225 | $42,502,081 |
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