<Tr> <Th> 1961 </Th> <Td> </Td> </Tr> <Tr> <Th> 1962 </Th> <Td> </Td> </Tr> <Tr> <Th> 1963 </Th> <Td> 5 </Td> </Tr> <Tr> <Th> 1964 </Th> <Td> 6 </Td> </Tr>

When did the nfl go to tie games