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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $24,304 | $12,698 | $145,876 | $411,185 | $39,314 | $34,542 | $2,111 |
| Electrical insulators, of ceramics | $324,918 | $493,032 | $391,316 | $571,173 | $286,055 | $274,114 | $248,701 |
| Electrical insulators of any mat. other than glass & ceramics | $366,972 | $424,730 | $338,755 | $378,586 | $383,201 | $356,977 | $495,543 |
| Total | $716,194 | $930,460 | $875,947 | $1,360,944 | $708,570 | $665,633 | $746,355 |
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