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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $3,091,880 | $2,186,150 | $3,655,057 | $759,451 | $4,517,813 | $3,722,808 |
| Electrical insulators, of ceramics | $332,230 | $935,910 | $773,446 | $1,171,920 | $428,133 | $1,944,600 |
| Electrical insulators of any mat. other than glass & ceramics | $1,002,689 | $496,315 | $481,693 | $739,817 | $2,077,270 | $2,369,564 |
| Total | $4,426,799 | $3,618,375 | $4,910,196 | $2,671,188 | $7,023,216 | $8,036,972 |
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