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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $3,388,961 | $1,849,470 | $1,828,734 | $2,553,318 | $1,923,000 | $2,652,793 | $1,066,133 |
| Electrical insulators, of ceramics | $32,423,884 | $24,306,710 | $29,530,600 | $34,294,503 | $29,992,408 | $37,439,986 | $29,844,215 |
| Electrical insulators of any mat. other than glass & ceramics | $64,223,458 | $77,317,997 | $67,811,924 | $86,715,533 | $84,131,987 | $94,955,265 | $81,858,855 |
| Total | $100,036,303 | $103,474,177 | $99,171,258 | $123,563,354 | $116,047,395 | $135,048,044 | $112,769,203 |
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