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