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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $104,051 | $42,354 | $126,226 | $141,596 | $181,164 | $207,896 | $218,694 |
| Electrical insulators, of ceramics | $358,546 | $206,933 | $208,009 | $381,555 | $378,308 | $294,626 | $409,568 |
| Electrical insulators of any mat. other than glass & ceramics | $106,219 | $121,427 | $108,916 | $181,079 | $70,384 | $90,829 | $86,478 |
| Total | $568,816 | $370,714 | $443,151 | $704,230 | $629,856 | $593,351 | $714,740 |
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