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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $89,341 | $72,069 | $140,893 | $474,883 | $653,166 | $455,354 | $223,658 |
| Electrical insulators, of ceramics | $8,410 | $6,183 | $2,326 | $6,166 | $417,818 | $84,901 | $178,049 |
| Electrical insulators of any mat. other than glass & ceramics | $197,872 | $489,148 | $246,907 | $448,633 | $313,556 | $579,986 | $262,469 |
| Total | $295,623 | $567,400 | $390,126 | $929,682 | $1,384,540 | $1,120,241 | $664,176 |
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