Season 1 ABC , 1977 - 1978 Season 2 ABC , 1978 - 1979 Season 3 ABC , 1979 - 1980 Season 4 ABC , 1980 - 1981 Season 5 ABC , 1981 - 1982 Season 6 ABC , 1983 Season 7 ABC , 1984 Season 8 ABC , 1984 - 1985 Season 9 ABC , 1985 Season 10 ABC , 1986 Season 11 ABC , 1987 - 1988 Season 12 ABC , 1988 - 1989 Season 13 ABC , 1991 Season 14 ABC , 1992 Season 15 ABC , 1992 - 1993 Season 16 ABC , 1993 - 1994 Season 17 ABC , 1994 - 1996