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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $23,478 | | $12,274 | $115,116 | $613,567 | $214,638 | $391,886 |
| Electrical insulators, of ceramics | $130,027 | $166,797 | $96,357 | $167,388 | $70,519 | $288,871 | $367,360 |
| Electrical insulators of any mat. other than glass & ceramics | $523,654 | $361,858 | $958,994 | $1,311,606 | $536,905 | $753,212 | $981,990 |
| Total | $677,159 | $528,655 | $1,067,625 | $1,594,110 | $1,220,991 | $1,256,721 | $1,741,236 |
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