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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $565,899 | $592,269 | $644,896 | $2,614,650 | $467,326 | $261,037 | $323,105 |
| Electrical insulators, of ceramics | $5,033,559 | $6,381,635 | $10,321,082 | $9,674,033 | $7,906,029 | $7,874,939 | $12,113,584 |
| Electrical insulators of any mat. other than glass & ceramics | $1,959,965 | $2,257,813 | $3,550,831 | $3,648,425 | $3,614,928 | $4,790,732 | $2,284,282 |
| Total | $7,559,423 | $9,231,717 | $14,516,809 | $15,937,108 | $11,988,283 | $12,926,708 | $14,720,971 |
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