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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2011 |
| Electrical insulators, of glass | $67,155 | $88,815 | $725,929 | $158,806 | $23,570 | $2,899 |
| Electrical insulators, of ceramics | $306,615 | $210,006 | $512,482 | $519,264 | $343,760 | $185,151 |
| Electrical insulators of any mat. other than glass & ceramics | $500,709 | $395,385 | $788,300 | $1,039,180 | $653,614 | $763,105 |
| Total | $874,479 | $694,206 | $2,026,711 | $1,717,250 | $1,020,944 | $951,155 |
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