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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $4,819,140 | $4,550,957 | $5,268,387 | $2,759,746 | $712,121 | $761,859 | $1,796,910 |
| Electrical insulators, of ceramics | $64,358,344 | $87,940,552 | $89,209,354 | $120,670,941 | $136,745,133 | $103,032,942 | $65,159,302 |
| Electrical insulators of any mat. other than glass & ceramics | $20,615,118 | $27,018,894 | $38,894,430 | $40,204,581 | $74,625,258 | $95,569,854 | $56,443,318 |
| Total | $89,792,602 | $119,510,403 | $133,372,171 | $163,635,268 | $212,082,512 | $199,364,655 | $123,399,530 |
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