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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $13,970 | $4,108 | $612 | $83,788 | $52,612 | $43,016 | $38,039 |
| Electrical insulators, of ceramics | $117,500 | $52,473 | $84,242 | $37,371 | $138,865 | $250,905 | $466,367 |
| Electrical insulators of any mat. other than glass & ceramics | $466,060 | $323,324 | $707,576 | $1,329,179 | $470,877 | $717,871 | $1,012,138 |
| Total | $597,530 | $379,905 | $792,430 | $1,450,338 | $662,354 | $1,011,792 | $1,516,544 |
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