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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $4,791,349 | $4,971,622 | $6,711,716 | $4,929,300 | $8,227,070 | $10,255,037 | $6,259,545 |
| Electrical insulators, of ceramics | $1,707,108 | $1,739,728 | $1,930,256 | $1,579,909 | $2,220,410 | $4,054,922 | $2,809,169 |
| Electrical insulators of any mat. other than glass & ceramics | $26,349,722 | $23,902,504 | $24,514,743 | $17,934,508 | $14,866,320 | $16,900,667 | $14,462,822 |
| Total | $32,848,179 | $30,613,854 | $33,156,715 | $24,443,717 | $25,313,800 | $31,210,626 | $23,531,536 |
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