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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $50,179 | $172,145 | $272,103 | $380,274 | $112,510 | $118,080 | $7,954 |
| Electrical insulators, of ceramics | $647,811 | $817,312 | $1,229,437 | $1,503,520 | $1,225,816 | $1,358,950 | $739,542 |
| Electrical insulators of any mat. other than glass & ceramics | $1,084,423 | $1,117,987 | $1,941,573 | $1,627,186 | $1,140,032 | $1,021,801 | $1,483,113 |
| Total | $1,782,413 | $2,107,444 | $3,443,113 | $3,510,980 | $2,478,358 | $2,498,831 | $2,230,609 |
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