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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | | | | $37,323 | $18,401 | $43,500 | $46,577 |
| Electrical insulators, of ceramics | $2,189,747 | $3,888,817 | $3,271,328 | $7,491,130 | $4,012,293 | $2,987,805 | $3,687,204 |
| Electrical insulators of any mat. other than glass & ceramics | $5,787,084 | $5,372,071 | $4,396,831 | $6,931,651 | $3,421,912 | $2,909,968 | $1,976,614 |
| Total | $7,976,831 | $9,260,888 | $7,668,159 | $14,460,104 | $7,452,606 | $5,941,273 | $5,710,395 |
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