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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $168,881 | $13,159 | $269,148 | $495,493 | | $71,184 |
| Electrical insulators, of ceramics | $237,499 | $93,732 | $818,502 | $226,742 | $496,177 | $700,485 |
| Electrical insulators of any mat. other than glass & ceramics | $523,618 | $3,379,038 | $6,043,234 | $2,203,054 | $6,909,218 | $5,684,577 |
| Total | $929,998 | $3,485,929 | $7,130,884 | $2,925,289 | $7,405,395 | $6,456,246 |
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