Seasons
Season 1
1 episodes
1968
Season 2
3 episodes
1969
Season 3
9 episodes
1970
Season 4
12 episodes
1971
Season 5
9 episodes
1972
Season 6
11 episodes
1973
Season 7
10 episodes
1974
Season 8
9 episodes
1975
Season 9
9 episodes
1976
Season 10
13 episodes
1977
Season 11
7 episodes
1978
Season 12
4 episodes
1979
Season 13
5 episodes
1980