1952

January-March 1952 (Estimate)
April/May 1952 (Estimate)
June-August 1952 (Estimate)
September/October 1952 (Estimate)
November/December 1952 (Estimate)

1953

January – March 1953
April/May 1953
June-August 1953
September/October 1953
November/December 1953

1954

January-March 1954
April/May 1954
June/July 1954
August-October 1954
November/December 1954

1955

January-March 1955
April/May 1955
June/July 1955
August/September 1955
October – December 1955

1956

January/February 1956
March/April 1956
May – August 1956
September/October 1956
November/December 1956

1957

January/February 1957
March/April 1957
May/June 1957
July/August 1957
September/October 1957
November/December 1957

1958

January/February 1958
March/April 1958
May/June 1958
July/August 1958
September/October 1958
November/December 1958

1959

January/February 1959
March/April 1959
May/June 1959
July/August 1959
September/October 1959
November/December 1959