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| Commodity | 2005 | 2006 | 2007 | 2008 | 2010 |
| Electrical insulators, of glass | $6,809 | $25,630 | $163,235 | $452,287 | $117,743 |
| Electrical insulators, of ceramics | $329,256 | $137,615 | $122,975 | $102,881 | $207,143 |
| Electrical insulators of any mat. other than glass & ceramics | $917,510 | $1,756,160 | $736,196 | $1,737,302 | $941,324 |
| Total | $1,253,575 | $1,919,405 | $1,022,406 | $2,292,470 | $1,266,210 |
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