<Tr> <Th> Class 3 (2004 → 2010) </Th> <Td> 19 </Td> <Td> 15 </Td> <Td> 0 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Th> 34 </Th> </Tr> <Tr> <Th> Up </Th> <Th> Class 1 </Th> <Td> 15 </Td> <Td> 17 </Td> <Td> </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Th> 33 </Th> </Tr> <Tr> <Th> Incumbent retired </Th> <Th> Held by same party </Th> <Td> </Td> <Td> </Td> <Td> </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Th> </Th> </Tr> <Tr> <Th> Replaced by other party </Th> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> <Th> 0 </Th> </Tr>

Legislative seats for which there is no incumbent running for reelection are known as