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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $180,180 | $20,107 | $138,489 | $134,893 | $152,578 | $56,679 | $15,190 |
| Electrical insulators, of ceramics | | $17,815 | $1,017 | $28,331 | $21,610 | $5,738 | $16,828 |
| Electrical insulators of any mat. other than glass & ceramics | $188,220 | $154,040 | $132,158 | $293,640 | $162,108 | $152,028 | $363,620 |
| Total | $368,400 | $191,962 | $271,664 | $456,864 | $336,296 | $214,445 | $395,638 |
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