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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $190,859 | $2,277,853 | $7,695,599 | $1,758,436 | $687,706 | $215,397 | $151,645 |
| Electrical insulators, of ceramics | $4,741,003 | $5,607,439 | $4,551,521 | $5,898,683 | $8,182,860 | $7,902,114 | $6,227,252 |
| Electrical insulators of any mat. other than glass & ceramics | $13,896,230 | $16,554,008 | $17,482,772 | $18,364,653 | $12,630,207 | $12,613,336 | $14,396,150 |
| Total | $18,828,092 | $24,439,300 | $29,729,892 | $26,021,772 | $21,500,773 | $20,730,847 | $20,775,047 |
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