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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $256,220 | $817,171 | $4,357,207 | $1,873,051 | $692,116 | $5,331,186 | $5,536,021 |
| Electrical insulators, of ceramics | $749,649 | $908,208 | $1,994,542 | $2,457,596 | $394,086 | $616,121 | $1,271,410 |
| Electrical insulators of any mat. other than glass & ceramics | $919,221 | $108,859 | $789,113 | $538,474 | $1,696,864 | $348,608 | $490,992 |
| Total | $1,925,090 | $1,834,238 | $7,140,862 | $4,869,121 | $2,783,066 | $6,295,915 | $7,298,423 |
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