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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $9,281,131 | $3,575,554 | $2,623,879 | $4,101,312 | $4,947,833 | $6,516,130 |
| Electrical insulators, of ceramics | $3,631,345 | $2,681,021 | $6,855,538 | $6,128,843 | $2,989,270 | $4,829,240 |
| Electrical insulators of any mat. other than glass & ceramics | $6,800,662 | $8,535,369 | $12,622,361 | $12,910,402 | $9,671,066 | $12,779,650 |
| Total | $19,713,138 | $14,791,944 | $22,101,778 | $23,140,557 | $17,608,169 | $24,125,020 |
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