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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $243,835 | $2,049,226 | $14,662 | $19,328 | $35,242 | $681,518 | $150,911 |
| Electrical insulators, of ceramics | $3,720,249 | $9,091,457 | $6,418,357 | $4,929,181 | $8,369,910 | $25,345,214 | $42,093,908 |
| Electrical insulators of any mat. other than glass & ceramics | $39,204,407 | $34,466,189 | $70,769,450 | $28,129,606 | $5,336,342 | $11,209,639 | $25,048,873 |
| Total | $43,168,491 | $45,606,872 | $77,202,469 | $33,078,115 | $13,741,494 | $37,236,371 | $67,293,692 |
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