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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $605,622 | $450,156 | $429,089 | $315,338 | $442,359 | $343,161 | $445,891 |
| Electrical insulators, of ceramics | $10,161,556 | $10,370,820 | $14,212,621 | $22,175,498 | $14,123,427 | $13,906,183 | $15,062,469 |
| Electrical insulators of any mat. other than glass & ceramics | $11,729,655 | $13,535,031 | $17,392,913 | $23,396,027 | $20,435,491 | $21,373,207 | $24,013,769 |
| Total | $22,496,833 | $24,356,007 | $32,034,623 | $45,886,863 | $35,001,277 | $35,622,551 | $39,522,129 |
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