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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $1,425,916 | $1,753,792 | $1,917,414 | $1,446,964 | $797,868 | $982,395 |
| Electrical insulators, of ceramics | $4,331,204 | $5,419,671 | $5,775,576 | $7,122,835 | $9,458,636 | $6,415,396 |
| Electrical insulators of any mat. other than glass & ceramics | $7,836,943 | $7,760,155 | $13,972,282 | $15,530,550 | $15,516,570 | $15,335,169 |
| Total | $13,594,063 | $14,933,618 | $21,665,272 | $24,100,349 | $25,773,074 | $22,732,960 |
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