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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $717,500 | $1,575,100 | $1,092,600 | $1,829,400 | $886,000 | $1,091,800 | $962,000 |
| Electrical insulators, of ceramics | $2,593,400 | $3,868,800 | $3,942,800 | $4,339,600 | $3,159,500 | $3,857,900 | $4,167,000 |
| Electrical insulators of any mat. other than glass & ceramics | $467,700 | $1,339,000 | $984,200 | $1,229,400 | $1,027,000 | $2,068,100 | $1,406,600 |
| Total | $3,778,600 | $6,782,900 | $6,019,600 | $7,398,400 | $5,072,500 | $7,017,800 | $6,535,600 |
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