Season 1

4 episodes · 1974

Season 2

12 episodes · 1975

Season 3

12 episodes · 1976

Season 4

12 episodes · 1977

Season 5

12 episodes · 1978

Season 6

12 episodes · 1979

Season 7

12 episodes · 1980

Season 8

12 episodes · 1981

Season 9

12 episodes · 1982

Season 10

12 episodes · 1983

Season 11

12 episodes · 1984

Season 12

12 episodes · 1985

Season 13

11 episodes · 1986

Season 14

13 episodes · 1987

Season 15

12 episodes · 1988

Season 16

12 episodes · 1989

Season 17

12 episodes · 1990

Season 18

12 episodes · 1991

Season 19

12 episodes · 1992

Season 20

12 episodes · 1993