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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $69,973 | $4,479 | $28,708 | $12,511 | $18,031 | $15,036 | $4,878 |
| Electrical insulators, of ceramics | $628,225 | $305,863 | $514,466 | $271,623 | $229,091 | $388,832 | $174,129 |
| Electrical insulators of any mat. other than glass & ceramics | $1,576,725 | $647,927 | $1,460,215 | $1,284,512 | $1,145,153 | $766,668 | $899,922 |
| Total | $2,274,923 | $958,269 | $2,003,389 | $1,568,646 | $1,392,275 | $1,170,536 | $1,078,929 |
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