April 15-May 1, 1981 May 2-15, 1981 May 16-31, 1981
     
June 12-July 2, 1981 July 3-July 19, 1981 July 20-July 31, 1981
     
August 1-31, 1981 September 1-7, 1981 September 8-13, 1981
     
 
September 25-October 12, 1981 October 17-25, 1981