Seasons
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Season 1
9 episodes
1972
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Season 2
18 episodes
1973
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Season 3
39 episodes
1974
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Season 4
14 episodes
1975
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Season 5
13 episodes
1976
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Season 6
14 episodes
1977
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Season 7
12 episodes
1978
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Season 8
13 episodes
1979
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Season 9
12 episodes
1980
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Season 10
14 episodes
1981
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Season 11
12 episodes
1982
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Season 12
13 episodes
1983
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Season 13
13 episodes
1984
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Season 14
13 episodes
1985
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Season 15
13 episodes
1986
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Season 16
10 episodes
1987