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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $1,640,219 | $3,927,555 | $2,933,631 | $1,595,634 | $1,717,358 | $2,285,659 | $3,106,645 |
| Electrical insulators, of ceramics | $5,368,019 | $8,078,981 | $7,722,236 | $9,417,435 | $7,421,301 | $8,625,094 | $11,166,066 |
| Electrical insulators of any mat. other than glass & ceramics | $16,998,954 | $28,241,391 | $30,336,345 | $28,053,110 | $20,291,819 | $30,740,502 | $22,225,092 |
| Total | $24,007,192 | $40,247,927 | $40,992,212 | $39,066,179 | $29,430,478 | $41,651,255 | $36,497,803 |
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