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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $234,207 | $209,164 | $109,530 | $17,955 | $202,244 | $174,045 | $569,992 |
| Electrical insulators, of ceramics | $888,658 | $1,079,621 | $1,015,811 | $1,246,366 | $1,801,620 | $1,402,827 | $1,583,986 |
| Electrical insulators of any mat. other than glass & ceramics | $688,187 | $647,407 | $2,507,083 | $1,007,929 | $1,347,608 | $924,983 | $1,293,561 |
| Total | $1,811,052 | $1,936,192 | $3,632,424 | $2,272,250 | $3,351,472 | $2,501,855 | $3,447,539 |
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