9th January 1973   6th February 1973   20th February 1973  
             
       
  6th March 1973   20th March 1973   3rd April 1973  
             
       
  16th April 1973   1st May 1973   15th May 1973  
             
       
  5th June 1973   19th June 1973   2nd July 1973  
             
       
  12th July 1973   31st July 1973   14th August 1973  
             
       
  11th September 1973   25th September 1973   13th November 1973  
             
         
  18th December 1973   31st December 1973