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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $22,848 | $6,473 | $30,923 | $364,284 | $245,968 | $218,302 | $6,421 |
| Electrical insulators, of ceramics | $73,620 | $548,058 | $44,090 | $1,055,844 | $186,625 | $46,100 | $16,083 |
| Electrical insulators of any mat. other than glass & ceramics | $1,619,537 | $1,605,213 | $3,260,997 | $2,699,144 | $1,051,086 | $3,309,376 | $252,159 |
| Total | $1,716,005 | $2,159,744 | $3,336,010 | $4,119,272 | $1,483,679 | $3,573,778 | $274,663 |
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