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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $4,894,758 | $23,063,119 | $27,073,195 | $45,983,841 | $21,947,699 | $15,925,196 | $19,082,544 |
| Electrical insulators, of ceramics | $1,293,675 | $346,324 | $305,307 | $2,108,293 | $1,383,893 | $1,558,516 | $1,176,080 |
| Electrical insulators of any mat. other than glass & ceramics | $3,092,972 | $4,794,548 | $4,909,984 | $9,516,834 | $6,508,644 | $16,147,180 | $6,413,378 |
| Total | $9,281,405 | $28,203,991 | $32,288,486 | $57,608,968 | $29,840,236 | $33,630,892 | $26,672,002 |
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