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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $343,910 | $647,450 | $521,797 | $281,871 | $322,537 | $132,427 | $12,663 |
| Electrical insulators, of ceramics | $42,954 | $119,595 | $262,470 | $515,108 | $291,807 | $172,270 | $149,205 |
| Electrical insulators of any mat. other than glass & ceramics | $1,230,067 | $1,442,141 | $2,376,497 | $3,043,050 | $2,107,461 | $1,790,826 | $1,351,949 |
| Total | $1,616,931 | $2,209,186 | $3,160,764 | $3,840,029 | $2,721,805 | $2,095,523 | $1,513,817 |
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