<Tr> <Td> Televisions and related equipment </Td> <Td> </Td> <Td> 83 </Td> <Td> 6% </Td> </Tr> <Tr> <Td> Clothes dryers </Td> <Td> </Td> <Td> 61 </Td> <Td> 4% </Td> </Tr> <Tr> <Td> Furnace fans and boiler circulation pumps </Td> <Td> </Td> <Td> 32 </Td> <Td> 2% </Td> </Tr> <Tr> <Td> Computers and related equipment </Td> <Td> </Td> <Td> 32 </Td> <Td> 2% </Td> </Tr>

When did voltage change from 110 to 120