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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $7,389,832 | $9,254,131 | $11,181,108 | $11,367,080 | $9,570,714 | $7,213,764 | $7,797,072 |
| Electrical insulators, of ceramics | $5,326,477 | $5,671,745 | $6,817,396 | $8,609,250 | $8,067,555 | $7,397,392 | $9,591,730 |
| Electrical insulators of any mat. other than glass & ceramics | $841,208 | $1,307,612 | $3,292,815 | $1,799,728 | $1,420,195 | $1,635,690 | $1,905,731 |
| Total | $13,557,517 | $16,233,488 | $21,291,319 | $21,776,058 | $19,058,464 | $16,246,846 | $19,294,533 |
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