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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $14,058 | $92,778 | $120,478 | $808,521 | $269,852 | $182,006 | $188,435 |
| Electrical insulators, of ceramics | $12,918,414 | $3,734,132 | $1,731,018 | $859,248 | $1,090,533 | $670,680 | $323,388 |
| Electrical insulators of any mat. other than glass & ceramics | $80,507,115 | $88,248,602 | $72,479,533 | $62,663,109 | $52,066,662 | $49,457,980 | $38,566,731 |
| Total | $93,439,587 | $92,075,512 | $74,331,029 | $64,330,878 | $53,427,047 | $50,310,666 | $39,078,554 |
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