<Tr> <Td> 1950s </Td> <Td> I Love Lucy </Td> <Td> 67.3 (1952--1953) </Td> <Td> 1952--1953 </Td> <Td> 1956--1957 </Td> <Td> </Td> <Td> CBS </Td> </Tr> <Tr> <Td> 1960s </Td> <Td> Gunsmoke </Td> <Td> 43.1 (1957--1958) </Td> <Td> 1957--1958 </Td> <Td> 1960--1961 </Td> </Tr> <Tr> <Td> 1970s </Td> <Td> All in the Family </Td> <Td> 34.0 (1971--1972) </Td> <Td> 1971--1972 </Td> <Td> 1975--1976 </Td> <Td> 5 </Td> </Tr> <Tr> <Td> 1980s </Td> <Td> The Cosby Show </Td> <Td> 34.9 (1986--1987) </Td> <Td> 1985--1986 </Td> <Td> 1989--1990 </Td> <Td> NBC </Td> </Tr>

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