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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $40,734 | $46,028 | $31,888 | $810,402 | $55,995 | $789,424 | $353,899 |
| Electrical insulators, of ceramics | $3,382,314 | $4,152,595 | $3,720,077 | $2,556,437 | $1,536,115 | $1,938,852 | $1,500,250 |
| Electrical insulators of any mat. other than glass & ceramics | $3,386,420 | $6,688,387 | $7,644,755 | $9,339,502 | $12,762,840 | $31,293,223 | $24,185,176 |
| Total | $6,809,468 | $10,887,010 | $11,396,720 | $12,706,341 | $14,354,950 | $34,021,499 | $26,039,325 |
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