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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $769 | $1,366 | $85,448 | $412,221 | $26,101 | $7,027 | $9,221 |
| Electrical insulators, of ceramics | $24,884 | $150,568 | $258,795 | $317,702 | $728,827 | $209,193 | $113,086 |
| Electrical insulators of any mat. other than glass & ceramics | $361,899 | $315,675 | $1,691,504 | $702,629 | $274,959 | $230,749 | $360,973 |
| Total | $387,552 | $467,609 | $2,035,747 | $1,432,552 | $1,029,887 | $446,969 | $483,280 |
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