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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | | | | $9,642 | $15,903 | $60,644 | $87,494 |
| Electrical insulators, of ceramics | $305,397 | $498,076 | $2,652,220 | $1,526,394 | $1,720,190 | $2,437,551 | $3,235,242 |
| Electrical insulators of any mat. other than glass & ceramics | $185,552 | $911,929 | $281,718 | $497,736 | $923,057 | $5,253,221 | $5,397,372 |
| Total | $490,949 | $1,410,005 | $2,933,938 | $2,033,772 | $2,659,150 | $7,751,416 | $8,720,108 |
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