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1960s 1970s 1980s
1970 Jan 1 March 1 April 26
 		 June 15 July 15
 		 Oct 1
 		 Oct 25
 
1971 Jan 1  Feb 1 
 Mar 15
 April 25
 July 1
 Sept 15
 		Oct 31
1972 Jan 1
 		 April 30
 		 June 15
 		 Oct 29
 
1973 Jan 1
 April 29
 June 1
 July 15
 Sept 1
 Oct 28
1974 Jan 7

 March 1
 		 May 1
 		 June 15
 		 July 15
 		 Oct 1
 		 Oct 27
 
1975 Feb 23
 		 April 27
 		 Aug 15
 		 Oct 26
 
1976 Jan 15
 April 25
 June 1
 Aug 1
 Oct 31
1977 Jan 1
 		 April 24
 		 June 15
 		 Sept 1
 		 Oct 30
 
1978 Jan 15
 		 March 1
 		 June 1
 		 Aug 1
 		 Sept 1
 		 Oct 29
 
1979 Jan 15
 		 April 1
 		 April 29
 		 Sept 1
 		 Oct 28
 

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Updated September 22, 2024
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