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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $584,782 | $647,258 | $1,092,308 | $1,440,944 | $610,261 | $563,093 | $920,741 |
| Electrical insulators, of ceramics | $8,517,979 | $4,670,442 | $6,698,840 | $6,706,792 | $4,959,611 | $7,060,186 | $5,372,295 |
| Electrical insulators of any mat. other than glass & ceramics | $16,723,123 | $21,706,262 | $26,407,471 | $24,345,462 | $18,688,036 | $21,742,623 | $16,312,151 |
| Total | $25,825,884 | $27,023,962 | $34,198,619 | $32,493,198 | $24,257,908 | $29,365,902 | $22,605,187 |
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