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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $16,813,716 | $15,418,923 | $31,156,292 | $23,198,045 | $20,947,418 | $17,296,501 |
| Electrical insulators, of ceramics | $5,210,964 | $6,394,159 | $7,634,802 | $4,517,479 | $4,597,852 | $5,595,563 |
| Electrical insulators of any mat. other than glass & ceramics | $2,147,193 | $1,467,854 | $2,711,673 | $2,440,971 | $4,898,938 | $3,308,344 |
| Total | $24,171,873 | $23,280,936 | $41,502,767 | $30,156,495 | $30,444,208 | $26,200,408 |
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