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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $53,915,342 | $45,243,162 | $57,522,959 | $63,764,709 | $52,311,660 | $55,590,086 | $55,365,745 |
| Electrical insulators, of ceramics | $22,190,872 | $28,109,050 | $24,044,813 | $28,542,540 | $23,110,339 | $25,288,191 | $20,300,203 |
| Electrical insulators of any mat. other than glass & ceramics | $62,870,531 | $68,727,189 | $83,416,418 | $109,692,987 | $85,180,102 | $80,741,564 | $84,301,690 |
| Total | $138,976,745 | $142,079,401 | $164,984,190 | $202,000,236 | $160,602,101 | $161,619,841 | $159,967,638 |
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