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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of ceramics | $10,353,542 | $13,077,996 | $12,278,394 | $14,538,183 | $9,742,226 | $9,707,004 | $11,338,530 |
| Electrical insulators of any mat. other than glass & ceramics | $194,368 | $130,347 | $160,668 | $609,624 | $1,092,812 | $554,882 | $1,312,276 |
| Total | $10,547,910 | $13,208,343 | $12,439,062 | $15,147,807 | $10,835,038 | $10,261,886 | $12,650,806 |
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