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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $90,985 | $145,220 | $233,191 | $136,927 | $135,332 | $160,673 |
| Electrical insulators, of ceramics | $4,954,040 | $4,780,553 | $4,640,994 | $7,905,494 | $7,299,728 | $14,932,984 |
| Electrical insulators of any mat. other than glass & ceramics | $6,771,596 | $5,718,845 | $6,926,522 | $11,233,232 | $10,526,399 | $10,883,394 |
| Total | $11,816,621 | $10,644,618 | $11,800,707 | $19,275,653 | $17,961,459 | $25,977,051 |
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