<Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Rating </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 20, 1984 (1984 - 09 - 20) </Td> <Td> May 9, 1985 (1985 - 05 - 09) </Td> <Td> </Td> <Td> 24.2 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 25 </Td> <Td_colspan="1"> September 26, 1985 (1985 - 09 - 26) </Td> <Td> May 15, 1986 (1986 - 05 - 15) </Td> <Td> </Td> <Td> 33.7 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 25 </Td> <Td_colspan="1"> September 25, 1986 (1986 - 09 - 25) </Td> <Td> May 7, 1987 (1987 - 05 - 07) </Td> <Td> </Td> <Td> 34.9 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 24, 1987 (1987 - 09 - 24) </Td> <Td> April 28, 1988 (1988 - 04 - 28) </Td> <Td> </Td> <Td> 27.8 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 26 </Td> <Td_colspan="1"> October 6, 1988 (1988 - 10 - 06) </Td> <Td> May 11, 1989 (1989 - 05 - 11) </Td> <Td> </Td> <Td> 25.6 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 26 + Special </Td> <Td_colspan="1"> September 21, 1989 (1989 - 09 - 21) </Td> <Td> May 3, 1990 (1990 - 05 - 03) </Td> <Td> </Td> <Td> 23.1 (Tied with Roseanne) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 7 </Td> <Td_colspan="2"> 26 </Td> <Td_colspan="1"> September 20, 1990 (1990 - 09 - 20) </Td> <Td> May 2, 1991 (1991 - 05 - 02) </Td> <Td> 5 </Td> <Td> 17.1 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 8 </Td> <Td_colspan="2"> 25 </Td> <Td_colspan="1"> September 19, 1991 (1991 - 09 - 19) </Td> <Td> April 30, 1992 (1992 - 04 - 30) </Td> <Td> 18 </Td> <Td> 15.0 </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Rating </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 20, 1984 (1984 - 09 - 20) </Td> <Td> May 9, 1985 (1985 - 05 - 09) </Td> <Td> </Td> <Td> 24.2 </Td> </Tr>

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