<Tr> <Td> </Td> <Td> Mud </Td> <Td> 45 </Td> </Tr> <Tr> <Td> 1976 </Td> <Td> Rod Stewart </Td> <Td> 48 </Td> </Tr> <Tr> <Td> 1977 </Td> <Td> Elvis Presley </Td> <Td> 49 </Td> </Tr> <Tr> <Td> 1978 </Td> <Td> John Travolta </Td> <Td> 60 </Td> </Tr>

Who has been at number 1 for the longest