"Year","From early to mid career","From early to late career","From mid to late career"
1914,,,71.28584
1915,,,70.20217
1916,,,66.9022
1917,,,65.06988
1918,,,66.53808
1919,,,67.00796
1920,,,66.66667
1921,,,67.08709
1922,,,66.33758
1923,,,65.7314
1924,,,66.76227
1925,,,67.66567
1926,62.61949,58.2562,68.14988
1927,64.46685,55.39813,66.56795
1928,65.50998,51.98767,66.81267
1929,63.382,51.98945,69.01024
1930,61.03682,55.33135,67.16319
1931,61.11619,56.61177,67.18584
1932,61.09246,54.67328,67.15147
1933,60.96386,54.5712,65.50108
1934,59.38408,53.83142,66.51678
1935,60.03455,54.9505,68.11258
1936,59.85795,53.54505,66.22994
1937,59.7454,53.22344,65.24548
1938,61.78429,54.56128,66.21336
1939,61.97109,57.33611,65.66934
1940,61.3177,55.74731,65.49502
1941,61.49578,55.19297,65.38677
1942,61.50156,55.29865,65.42148
1943,61.65688,55.29073,66.69024
1944,61.04034,54.07265,66.01774
1945,61.43469,53.81349,64.86187
1946,61.99508,53.62685,66.08022
1947,62.12431,53.10382,66.2559
1948,62.53106,53.04495,66.7033
1949,62.1797,52.05849,67.2459
1950,62.55192,53.73282,67.1019
1951,62.3849,,
1952,62.00203,,
1953,63.5175,,
1954,62.91577,,
1955,63.70457,,
1956,62.35906,,
1957,63.06784,,
1958,62.51006,,
1959,65.12036,,
1960,64.95456,,
1961,64.30814,,
1962,64.32289,,