"Year","Early career: age 25 to 36","Mid career: age 37 to 48","Late career: age 49 to 60"
1902,,,11.84347
1903,,,11.66486
1904,,,11.38838
1905,,,11.6322
1906,,,11.79065
1907,,,11.53835
1908,,,11.48308
1909,,,11.71697
1910,,,11.60534
1911,,,11.81285
1912,,,11.7952
1913,,,11.65952
1914,,11.53260,11.80948
1915,,11.65582,11.66879
1916,,11.65515,11.65907
1917,,11.50520,11.36105
1918,,11.30328,11.19673
1919,,11.11485,11.30491
1920,,10.99604,11.02567
1921,,10.75894,10.72839
1922,,10.64895,10.65088
1923,,11.08061,10.67993
1924,,10.95998,10.65926
1925,,10.83394,10.34890
1926,11.89201,10.86766,10.75234
1927,11.64361,10.61421,10.43706
1928,11.33925,10.60733,10.38497
1929,11.12956,10.60679,10.02062
1930,11.09046,10.33447,9.965794
1931,11.06966,10.28807,9.995598
1932,11.17315,10.03124,9.92096
1933,11.21981,10.12679,9.865609
1934,11.27663,10.06291,9.654365
1935,11.44476,9.924858,9.8222
1936,11.46215,10.19139,9.714572
1937,11.40985,9.956436,9.853178
1938,11.35823,10.03301,9.712234
1939,11.24731,9.924762,9.73309
1940,11.22056,9.587157,9.37949
1941,10.85053,9.586929,9.542099
1942,10.80257,9.417967,9.592315
1943,10.83205,9.623603,9.857753
1944,10.81935,9.603215,9.983826
1945,10.79638,9.388857,
1946,11.07784,9.541806,
1947,11.04039,9.481386,
1948,11.15691,9.513479,
1949,11.35095,9.702161,
1950,11.35571,9.734775,
1951,11.45826,9.98415,
1952,11.46825,9.81753,
1953,11.43530,9.961577,
1954,11.45145,10.23097,
1955,11.48564,10.07204,
1956,11.63491,10.03166,
1957,11.74601,,
1958,11.84413,,
1959,11.86756,,
1960,11.86395,,
1961,12.01869,,
1962,12.10712,,
1963,12.16819,,
1964,12.38769,,
1965,12.47945,,
1966,12.44947,,
1967,12.33940,,
1968,12.29768,,