Seasons
Season 1
74 episodes
1972
Season 2
29 episodes
1976
Season 3
45 episodes
1976
Season 4
25 episodes
1977
Season 5
37 episodes
1978
Season 6
35 episodes
1979
Season 7
34 episodes
1980
Season 8
23 episodes
1981
Season 9
34 episodes
1982
Season 10
19 episodes
1983
Season 11
14 episodes
1984
Season 12
15 episodes
1985
Season 13
14 episodes
1986
Season 14
9 episodes
1987
Season 15
21 episodes
1988
Season 16
17 episodes
1989
Season 17
16 episodes
1990
Season 18
15 episodes
1992
Season 19
5 episodes
1996