1970

January
February
March
April
May
June
August
September
October
November
December

1971

January
February
March
April
May
June
July
August
September
October
November

1972

June
October 

1973

January
May
June
July
August-September
October
November 

1974

February
March
April
May
June
July
August
September
November
December 

1975

January
February
March
April
May
July 

1977

July-August

1978

January-February
May-June