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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $975,690 | $408,656 | $930,236 | $913,932 | $735,539 | $838,607 | $1,925,571 |
| Electrical insulators, of ceramics | $37,194,946 | $41,154,371 | $50,453,021 | $56,746,352 | $45,413,089 | $43,568,641 | $45,656,218 |
| Electrical insulators of any mat. other than glass & ceramics | $33,241,671 | $25,679,701 | $18,395,060 | $22,815,187 | $15,770,628 | $18,497,185 | $20,923,592 |
| Total | $71,412,307 | $67,242,728 | $69,778,317 | $80,475,471 | $61,919,256 | $62,904,433 | $68,505,381 |
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