<Tr> <Td> 55 </Td> <Td> Mexico </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 6 </Td> </Tr> <Tr> <Td> 56 </Td> <Td> Brazil </Td> <Td> </Td> <Td> </Td> <Td> 7 </Td> <Td> 9 </Td> </Tr> <Tr> <Td> 57 </Td> <Td> Macau </Td> <Td> </Td> <Td> 0 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 57 </Td> <Td> Singapore </Td> <Td> </Td> <Td> 0 </Td> <Td> </Td> <Td> </Td> </Tr>

When did the winter and summer olympics seperate