Seasons
No Poster
Season 1
6 episodes
1971
No Poster
Season 2
10 episodes
1972
No Poster
Season 3
10 episodes
1973
No Poster
Season 4
10 episodes
1974
No Poster
Season 5
10 episodes
1975
No Poster
Season 6
10 episodes
1976
No Poster
Season 7
10 episodes
1977
No Poster
Season 8
10 episodes
1978
No Poster
Season 9
10 episodes
1979
No Poster
Season 10
10 episodes
1980
No Poster
Season 11
10 episodes
1981
No Poster
Season 12
10 episodes
1982
No Poster
Season 13
10 episodes
1983
No Poster
Season 14
10 episodes
1984
No Poster
Season 15
10 episodes
1985
No Poster
Season 16
7 episodes
1986
No Poster
Season 17
29 episodes
2011
No Poster
Season 18
10 episodes
2013