<Tr> <Td> 15 </Td> <Td> 1918 </Td> <Td> Columbus </Td> <Td> Michigan </Td> <Td> 14--0 </Td> </Tr> <Tr> <Td> 16 </Td> <Td> 1919 </Td> <Td> Ann Arbor </Td> <Td> Ohio State </Td> <Td> 13--3 </Td> </Tr> <Tr> <Td> 17 </Td> <Td> 1920 </Td> <Td> Columbus </Td> <Td> Ohio State </Td> <Td> 14--7 </Td> </Tr> <Tr> <Td> 18 </Td> <Td> 1921 </Td> <Td> Ann Arbor </Td> <Td> Ohio State </Td> <Td> 14--0 </Td> </Tr>

How many days has it been since michigan beat ohio state