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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $14,160,837 | $29,610,030 | $36,997,453 | $37,138,867 | $26,241,207 | $34,626,631 | $29,585,038 |
| Electrical insulators, of ceramics | $17,027,346 | $17,957,146 | $19,536,065 | $19,320,484 | $19,418,743 | $15,924,973 | $13,663,847 |
| Electrical insulators of any mat. other than glass & ceramics | $8,038,393 | $15,150,013 | $21,962,420 | $12,879,706 | $11,179,080 | $10,035,883 | $7,455,793 |
| Total | $39,226,576 | $62,717,189 | $78,495,938 | $69,339,057 | $56,839,030 | $60,587,487 | $50,704,678 |
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