"Year","From early to mid career","From early to late career","From mid to late career"
1914,,,6.011822
1915,,,6.186204
1916,,,6.63958
1917,,,6.483561
1918,,,6.105287
1919,,,5.838259
1920,,,7.011331
1921,,,6.918664
1922,,,7.177871
1923,,,7.2373
1924,,,7.020548
1925,,,7.624736
1926,4.198506,9.068125,7.398317
1927,3.882465,9.215912,6.874781
1928,4.580531,10.04153,7.430998
1929,4.872763,10.75698,6.621331
1930,4.011967,10.26980,6.869961
1931,4.089138,10.03741,7.142857
1932,5.175534,11.13882,6.893996
1933,4.550459,12.10505,7.089552
1934,4.964286,12.61663,7.452276
1935,5.704225,12.4,7.112376
1936,5.072967,12.70281,8.253631
1937,5.34868,12.90198,8.05204
1938,4.840806,11.75824,6.908004
1939,5.112734,12.40902,7.304117
1940,4.636974,12.00555,8.146511
1941,4.878049,13.29857,8.348624
1942,5.831861,12.8264,8.344477
1943,5.28505,13.23367,8.518422
1944,5.272588,12.25732,8.067646
1945,5.507172,12.55185,7.794201
1946,5.490028,12.43581,8.024673
1947,5.942083,12.28257,7.802715
1948,6.155359,12.13592,7.787093
1949,5.463836,13.72086,8.131887
1950,6.011561,13.12964,8.561951
1951,6.270627,,
1952,6.485062,,
1953,5.974249,,
1954,6.262327,,
1955,6.032258,,
1956,6.516291,,
1957,6.29471,,
1958,5.92571,,
1959,6.100863,,
1960,5.318174,,
1961,6.560326,,
1962,6.684403,,