Seasons
Season 1
1 episodes
1969
Season 2
1 episodes
1970
Season 3
4 episodes
1971
Season 4
1 episodes
1972
Season 5
1 episodes
1973
Season 6
1 episodes
1974
Season 7
6 episodes
1975
Season 8
6 episodes
1976
Season 9
3 episodes
1977
Season 10
6 episodes
1978
Season 11
7 episodes
1979
Season 12
6 episodes
1980
Season 13
7 episodes
1981
Season 14
4 episodes
1982
Season 15
6 episodes
1983
Season 16
6 episodes
1984
Season 17
6 episodes
1985
Season 18
6 episodes
1986
Season 19
5 episodes
1987
Season 20
6 episodes
1988
Season 21
8 episodes
1989
Season 22
3 episodes
1990
Season 23
6 episodes
1995
Season 24
6 episodes
1996
Season 25
6 episodes
1997
Season 26
12 episodes
1998