"Year","Early career: age 25 to 36","Mid career: age 37 to 48","Late career: age 49 to 60"
1902,,,47.9238
1903,,,48.34549
1904,,,48.20858
1905,,,47.34336
1906,,,46.90686
1907,,,47.29191
1908,,,48.0343
1909,,,47.35865
1910,,,47.84724
1911,,,46.76842
1912,,,47.13818
1913,,,47.40852
1914,,46.71162,47.66362
1915,,45.63278,48.01725
1916,,45.13128,47.86613
1917,,46.26419,48.8912
1918,,47.12073,49.0657
1919,,47.05832,48.7711
1920,,46.9002,49.41062
1921,,47.37733,50.07372
1922,,47.52452,49.85552
1923,,47.29058,50.03976
1924,,47.83961,50.93399
1925,,48.0156,51.90886
1926,43.40868,47.73231,50.9564
1927,43.46256,48.24319,51.5012
1928,43.93827,48.0051,52.0044
1929,44.43581,48.58702,53.00068
1930,44.62015,49.05568,53.30411
1931,44.82482,49.07229,53.2687
1932,44.6702,49.77636,53.85392
1933,44.76838,49.97392,54.05086
1934,44.99922,50.78166,55.62963
1935,44.10497,50.62377,54.69741
1936,44.80045,50.81105,55.4814
1937,44.68941,50.827,54.834
1938,44.90156,51.56614,55.65424
1939,45.14547,51.67822,55.85411
1940,45.5266,53.14881,57.63527
1941,45.95368,52.90897,56.92469
1942,46.22199,54.0637,57.21678
1943,46.2463,53.60422,56.40759
1944,46.97879,54.12298,56.59009
1945,47.14485,54.33065,
1946,46.91795,54.06153,
1947,47.66985,54.48907,
1948,47.50516,54.3138,
1949,47.48765,54.11279,
1950,47.69743,54.00276,
1951,47.48968,53.44539,
1952,47.72815,54.98883,
1953,47.81219,54.52538,
1954,48.03651,54.08258,
1955,48.45969,54.8187,
1956,48.47621,55.64615,
1957,48.33114,,
1958,48.50832,,
1959,47.68266,,
1960,48.38463,,
1961,47.95394,,
1962,48.16089,,
1963,48.29822,,
1964,48.07293,,
1965,48.30255,,
1966,48.27865,,
1967,48.70177,,
1968,49.12072,,