"Year","From early to mid career","From early to late career","From mid to late career"
1914,,,66.22905
1915,,,65.87931
1916,,,63.04999
1917,,,64.10964
1918,,,67.06679
1919,,,67.5147
1920,,,65.68697
1921,,,65.37293
1922,,,65.54622
1923,,,65.58803
1924,,,64.82877
1925,,,63.63317
1926,67.93315,56.99111,63.99018
1927,69.29082,57.53266,65.52087
1928,69.9057,55.68379,64.40198
1929,69.58803,53.62394,63.67215
1930,71.23801,57.57273,64.87907
1931,71.50336,60.29009,63.80707
1932,69.09157,55.02909,63.78799
1933,68.55046,54.16496,63.8806
1934,68.57143,54.32049,63.43612
1935,67.35915,53.84,62.83784
1936,69.35372,53.58132,62.7701
1937,68.04333,54.78497,62.93952
1938,68.22612,53.44322,63.53371
1939,67.64052,52.72926,62.1182
1940,68.1208,53.95559,63.65646
1941,68.4669,52.21643,62.50765
1942,66.80131,52.08034,64.74993
1943,66.79716,52.13178,64.25398
1944,66.00973,50.85482,64.15304
1945,65.93238,50.68255,64.48535
1946,64.25048,50.6388,65.60303
1947,65.40053,51.50348,65.9915
1948,64.40511,49.14908,65.62058
1949,64.48506,49.36646,64.94024
1950,63.06358,47.54834,64.54162
1951,63.87972,,
1952,64.39367,,
1953,64.12017,,
1954,64.49704,,
1955,64.75806,,
1956,65.14724,,
1957,66.02874,,
1958,67.50674,,
1959,64.915,,
1960,67.02241,,
1961,64.95003,,
1962,64.75676,,