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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $571,158 | $142,134 | $112,829 | $98,069 | $160,858 | $8,023 | $6,116 |
| Electrical insulators, of ceramics | $642,500 | $451,727 | $467,627 | $649,905 | $472,884 | $1,195,083 | $1,093,463 |
| Electrical insulators of any mat. other than glass & ceramics | $1,101,288 | $1,306,044 | $1,462,475 | $1,773,330 | $1,693,100 | $700,669 | $475,612 |
| Total | $2,314,946 | $1,899,905 | $2,042,931 | $2,521,304 | $2,326,842 | $1,903,775 | $1,575,191 |
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