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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $66,362 | $53,897 | $185,295 | $49,401 | $4,971 | $1,035 | $2,141 |
| Electrical insulators, of ceramics | $1,042,162 | $1,691,746 | $1,601,593 | $1,692,692 | $1,791,171 | $1,776,993 | $1,506,153 |
| Electrical insulators of any mat. other than glass & ceramics | $3,800,555 | $3,756,532 | $4,648,844 | $3,541,740 | $3,244,847 | $3,209,040 | $3,673,559 |
| Total | $4,909,079 | $5,502,175 | $6,435,732 | $5,283,833 | $5,040,989 | $4,987,068 | $5,181,853 |
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