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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $30,220 | $328,379 | $464,962 | $386,649 | $629,649 | $764,400 | $775,256 |
| Electrical insulators, of ceramics | $11,341,952 | $13,603,160 | $14,849,655 | $16,774,448 | $12,847,959 | $13,192,748 | $14,846,110 |
| Electrical insulators of any mat. other than glass & ceramics | $27,345,365 | $21,203,482 | $19,494,849 | $27,848,685 | $19,637,849 | $16,262,080 | $17,529,009 |
| Total | $38,717,537 | $35,135,021 | $34,809,466 | $45,009,782 | $33,115,457 | $30,219,228 | $33,150,375 |
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