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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $1,181,724 | $1,935,922 | $2,853,570 | $2,399,213 | $3,023,982 | $2,213,891 | $1,412,740 |
| Electrical insulators, of ceramics | $2,145,611 | $3,127,309 | $5,779,901 | $3,546,514 | $1,160,276 | $1,417,623 | $1,140,418 |
| Electrical insulators of any mat. other than glass & ceramics | $1,432,777 | $2,491,730 | $2,474,052 | $6,221,959 | $2,691,167 | $2,467,215 | $2,149,680 |
| Total | $4,760,112 | $7,554,961 | $11,107,523 | $12,167,686 | $6,875,425 | $6,098,729 | $4,702,838 |
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