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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Electrical insulators, of glass | $568 | $34,820 | $6,632 | $641,159 | $36,251 | $37,055 |
| Electrical insulators, of ceramics | $183,312 | $580,083 | $790,575 | $538,000 | $723,575 | $225,860 |
| Electrical insulators of any mat. other than glass & ceramics | $375,370 | $679,538 | $486,110 | $552,682 | $794,088 | $530,460 |
| Total | $559,250 | $1,294,441 | $1,283,317 | $1,731,841 | $1,553,914 | $793,375 |
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