By date

FROM SEPTEMBER 1937 TO APRIL 1994

♦

1. Between 1937 and 1969

September 1937 to October 1952

September 1953 to April 1965

January 1966 to December 1967

January 1968 to December 1969

♦

2. Between 1970 and 1975

January to December 1970

January 1971 to December 1972

January 1973 to December 1974

January to December 1975

♦

3. Between 1976 and 1979

January to June 1976

July to December 1976

January to December 1977

January to December 1978

January to June 1979

July to December 1979

♦

4. January to December 1980

January to March

April to June

July to September

October to December

♦

5. Between 1981 and 1986

January to December 1981

January 1982 to December 1983

January 1984 to December 1986

♦

6. Between 1987 and 1994

January 1987 to December 1988

January to December 1989

January 1990 to April 1994