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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $857 | $74,680 | $53,584 | $23,573 | $46,201 | $473,002 |
| Electrical insulators, of ceramics | | $1,837 | $1,062 | | $115,699 | $168,982 |
| Electrical insulators of any mat. other than glass & ceramics | $19,217 | $185,488 | $241,986 | $800,291 | $857,421 | $836,154 |
| Total | $20,074 | $262,005 | $296,632 | $823,864 | $1,019,321 | $1,478,138 |
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