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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $4,714,473 | $2,114,230 | $1,467,448 | $599,236 | $298,556 | $187,777 | $744,736 |
| Electrical insulators, of ceramics | $2,192,320 | $3,054,005 | $1,559,168 | $1,049,346 | $1,091,239 | $2,735,226 | $3,416,031 |
| Electrical insulators of any mat. other than glass & ceramics | $22,866,908 | $15,256,149 | $20,822,801 | $21,520,337 | $18,958,513 | $17,097,713 | $16,226,072 |
| Total | $29,773,701 | $20,424,384 | $23,849,417 | $23,168,919 | $20,348,308 | $20,020,716 | $20,386,839 |
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