Season 1
1 episodesAVG 7.60
Best: E1 "1 January 1964" (7.6)
Season 2
3 episodesAVG 4.37
Best: E9 "4 March 1965" (4.8)
Season 8
1 episodesAVG 6.90
Best: E52 "Episode 52" (6.9)
Season 9
1 episodesAVG 6.60
Best: E52 "Episode 52" (6.6)
Season 10
2 episodesAVG 7.30
Best: E41 "Episode 41" (7.5)
Season 12
6 episodesAVG 6.45
Best: E30 "Episode 30" (6.7)
Season 13
16 episodesAVG 6.61
Best: E35 "26th August 1976" (7.8)
Season 14
11 episodesAVG 7.45
Best: E20 "19th May 1977" (9.0)
Season 15
7 episodesAVG 6.83
Best: E22 "15th June 1978" (8.0)
Season 16
12 episodesAVG 6.83
Best: E44 "8th November 1979" (7.4)
Season 17
6 episodesAVG 7.05
Best: E6 "Episode 6" (8.0)
Season 18
13 episodesAVG 7.15
Best: E9 "Episode 9" (7.8)
Season 19
16 episodesAVG 7.26
Best: E6 "Episode 6" (8.0)
Season 20
6 episodesAVG 6.92
Best: E5 "Episode 5" (7.4)
Season 21
12 episodesAVG 7.53
Best: E50 "Episode 50" (8.6)
Season 22
14 episodesAVG 7.16
Best: E52 "Christmas Special 1985" (8.1)
Season 23
11 episodesAVG 7.17
Best: E7 "February 13, 1986" (7.8)
Season 24
7 episodesAVG 7.26
Best: E6 "February 5, 1987" (7.8)
Season 25
16 episodesAVG 7.07
Best: E33 "August 18, 1988" (8.0)
Season 26
12 episodesAVG 6.87
Best: E47 "November 23, 1989" (7.6)
Season 27
14 episodesAVG 6.91
Best: E41 "October 11, 1990" (7.4)
Season 28
23 episodesAVG 6.62
Best: E34 "August 22, 1991" (7.4)
Season 29
16 episodesAVG 6.73
Best: E8 "February 20, 1992" (7.4)
Season 30
18 episodesAVG 6.61
Best: E20 "May 21, 1993" (8.1)
Season 31
42 episodesAVG 7.16
Best: E47 "November 24, 1994" (8.0)
Season 32
46 episodesAVG 7.14
Best: E20 "May 18, 1995" (8.0)
Season 33
42 episodesAVG 6.82
Best: E15 "April 11, 1996" (7.6)
Season 34
40 episodesAVG 6.53
Best: E4 "January 31st, 1997" (7.4)
Season 35
51 episodesAVG 6.47
Best: E51 "25th December 1998" (7.5)
Season 36
22 episodesAVG 6.35
Best: E11 "19th March 1999" (7.1)
Season 38
1 episodesAVG 9.60
Best: E20 "25th May 2001" (9.6)
Season 39
3 episodesAVG 5.23
Best: E51 "25th December 2002" (8.4)
Season 41
1 episodesAVG 4.10
Best: E51 "25th December 2004" (4.1)