Seasons
- 1
Season 1
6 episodes · 1971
- 2
Season 2
10 episodes · 1972
- 3
Season 3
10 episodes · 1973
- 4
Season 4
10 episodes · 1974
- 5
Season 5
10 episodes · 1975
- 6
Season 6
10 episodes · 1976
- 7
Season 7
10 episodes · 1977
- 8
Season 8
10 episodes · 1978
- 9
Season 9
10 episodes · 1979
- 10
Season 10
10 episodes · 1980
- 11
Season 11
10 episodes · 1981
- 12
Season 12
10 episodes · 1982
- 13
Season 13
10 episodes · 1983
- 14
Season 14
10 episodes · 1984
- 15
Season 15
10 episodes · 1985
- 16
Season 16
7 episodes · 1986
- 17
Season 17
29 episodes · 2011
- 18
Season 18
10 episodes · 2013
