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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $146,041 | $48,345 | $42,214 | $163,648 | $25,547 | $116,763 | $145,469 |
| Electrical insulators, of ceramics | $1,040 | $1,855 | $76 | $3,040 | $1,713 | | $469 |
| Electrical insulators of any mat. other than glass & ceramics | $20,492 | $9,653 | $46,278 | $87,149 | $14,986 | $15,068 | $23,896 |
| Total | $167,573 | $59,853 | $88,568 | $253,837 | $42,246 | $131,831 | $169,834 |
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