Episodes have had their first transmission on 1 January in the following years:
|73 - 96||1973, 1974, 1991 Series: 1, 2, 19
|97 - 09|| 1997, 1998, 2001, 2002, 2004, 2006, 2007, 2008, 2009
| 1973 to 1996
||Clear boxes denote the date is between series'
|Grey boxes denote the date is between seasons
| 1997 onwards
|| Colour means an episode would normally transmit
Episodes shown from 1973 to 1999 are listed in the following table:
Episodes shown since 2000 are listed in the following table:
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