<Tr> <Td> Old Firm final </Td> <Td> 7 (7) </Td> <Td> 7 (7) </Td> <Td> 14 </Td> <Td> 11% </Td> </Tr> <Tr> <Td> One winner, other not involved </Td> <Td> 31 </Td> <Td> 26 </Td> <Td> 57 </Td> <Td> 43% </Td> </Tr> <Tr> <Td> Cup wins by an Old Firm club </Td> <Td> 38 </Td> <Td> 33 </Td> <Td> 71 </Td> <Td> 54% </Td> </Tr> <Tr> <Td> One runner - up, other not involved </Td> <Td> N / A (11) </Td> <Td> N / A (11) </Td> <Td> 22 </Td> <Td> 17% </Td> </Tr>

When did rangers last beat celtic at ibrox