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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $127,153 | $22,554 | $76,728 | $74,818 | $35,398 | $49,306 | $220,668 |
| Electrical insulators, of ceramics | $46,983 | $126,947 | $161,791 | $76,544 | $171,365 | $648,683 | $448,705 |
| Electrical insulators of any mat. other than glass & ceramics | $22,924 | $100,464 | $34,948 | $97,687 | $38,415 | $452,207 | $266,511 |
| Total | $197,060 | $249,965 | $273,467 | $249,049 | $245,178 | $1,150,196 | $935,884 |
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