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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $68,277 | $614,371 | $129,576 | $356,803 | $89,548 | $110,642 | $152,269 |
| Electrical insulators, of ceramics | $9,102,441 | $11,850,735 | $17,202,244 | $23,037,595 | $19,366,150 | $15,796,574 | $18,871,450 |
| Electrical insulators of any mat. other than glass & ceramics | $2,131,671 | $2,547,519 | $6,297,235 | $6,156,365 | $4,163,567 | $4,840,028 | $7,196,576 |
| Total | $11,302,389 | $15,012,625 | $23,629,055 | $29,550,763 | $23,619,265 | $20,747,244 | $26,220,295 |
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