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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $8,300 | | | $75,600 | $57,900 | $67,400 | $14,500 |
| Electrical insulators, of ceramics | $20,300 | $27,200 | $40,300 | $22,100 | $54,900 | $66,300 | $40,900 |
| Electrical insulators of any mat. other than glass & ceramics | $65,300 | $46,600 | $36,100 | $21,300 | $6,900 | $159,500 | $68,500 |
| Total | $93,900 | $73,800 | $76,400 | $119,000 | $119,700 | $293,200 | $123,900 |
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