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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $1,008,000 | $1,790,000 | $2,752,000 | $3,795,000 | $2,345,000 | $855,961 | $1,263,759 |
| Electrical insulators, of ceramics | $55,292,000 | $76,386,000 | $71,575,000 | $90,930,000 | $74,483,000 | $82,936,765 | $86,444,115 |
| Electrical insulators of any mat. other than glass & ceramics | $83,694,000 | $102,027,000 | $132,654,000 | $133,053,000 | $146,722,000 | $160,880,868 | $169,698,956 |
| Total | $139,994,000 | $180,203,000 | $206,981,000 | $227,778,000 | $223,550,000 | $244,673,594 | $257,406,830 |
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