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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $640,656 | $581,777 | $1,380,544 | $1,666,030 | $5,348,350 | $4,351,416 | $1,013,744 |
| Electrical insulators, of ceramics | $2,498,648 | $3,926,317 | $2,474,634 | $3,856,269 | $4,332,341 | $3,947,952 | $5,044,227 |
| Electrical insulators of any mat. other than glass & ceramics | $5,969,031 | $4,800,038 | $5,611,402 | $5,778,566 | $8,178,226 | $5,217,084 | $7,554,392 |
| Total | $9,108,335 | $9,308,132 | $9,466,580 | $11,300,865 | $17,858,917 | $13,516,452 | $13,612,363 |
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