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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $8,091,435 | $10,807,684 | $17,862,195 | $40,020,284 | $34,199,788 | $54,867,807 | $85,999,493 |
| Electrical insulators, of ceramics | $51,803,595 | $72,031,182 | $101,856,446 | $136,293,647 | $132,981,378 | $187,257,490 | $251,550,971 |
| Electrical insulators of any mat. other than glass & ceramics | $19,419,388 | $40,868,644 | $60,177,942 | $91,719,396 | $95,305,706 | $107,016,806 | $140,158,515 |
| Total | $79,314,418 | $123,707,510 | $179,896,583 | $268,033,327 | $262,486,872 | $349,142,103 | $477,708,979 |
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