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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $926,575 | $417,356 | $250,924 | $120,643 | $77,002 | $394,152 | $383,284 |
| Electrical insulators, of ceramics | $5,981,764 | $6,161,655 | $7,015,251 | $7,561,547 | $5,285,506 | $6,172,827 | $6,644,750 |
| Electrical insulators of any mat. other than glass & ceramics | $10,641,570 | $14,951,360 | $22,888,831 | $28,070,874 | $20,914,381 | $29,543,888 | $27,467,642 |
| Total | $17,549,909 | $21,530,371 | $30,155,006 | $35,753,064 | $26,276,889 | $36,110,867 | $34,495,676 |
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