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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $22,863 | $322,528 | $1,523,376 | $395,521 | $393,938 | $11,109,590 | $4,741,876 |
| Electrical insulators, of ceramics | $2,355,709 | $2,758,643 | $3,823,581 | $4,229,999 | $3,234,607 | $7,585,662 | $4,797,280 |
| Electrical insulators of any mat. other than glass & ceramics | $1,992,710 | $2,825,522 | $2,907,350 | $3,126,744 | $3,816,167 | $3,921,357 | $3,742,350 |
| Total | $4,371,282 | $5,906,693 | $8,254,307 | $7,752,264 | $7,444,712 | $22,616,609 | $13,281,506 |
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