Season 1
4 episodes · 1974
Season 2
12 episodes · 1975
Season 3
12 episodes · 1976
Season 4
12 episodes · 1977
Season 5
12 episodes · 1978
Season 6
12 episodes · 1979
Season 7
12 episodes · 1980
Season 8
12 episodes · 1981
Season 9
12 episodes · 1982
Season 10
12 episodes · 1983
Season 11
12 episodes · 1984
Season 12
12 episodes · 1985
Season 13
11 episodes · 1986
Season 14
13 episodes · 1987
Season 15
12 episodes · 1988
Season 16
12 episodes · 1989
Season 17
12 episodes · 1990
Season 18
12 episodes · 1991
Season 19
12 episodes · 1992
Season 20
12 episodes · 1993