1901-2000 Inches 1 2.33 2.53 -0.20 71 58 1952 2018 1990 1986 normal 2 7.13 5.46 1.67 96 33 1952 2018 1990 1986 top-third 1960 3 10.16 7.77 2.39 106 23 1952 1974,2018 1990 1986 top-third 4 13.24 10.11 3.13 108 21 1956 1919 1990 1986 top-third 5 17.38 12.97 4.41 115 14 1956 1919 1990 1986 top-third 6 21.00 16.34 4.66 116 13 2011 1919 1990 1986 top-tenth 7 23.92 18.70 5.22 114 15 2011 1941 1990 1986 top-third 8 24.93 20.36 4.57 110 19 2011 1941 1990 1986 top-third 9 26.58 21.96 4.62 109 20 2011 1941 1990 1986 top-third 10 30.11 23.44 6.67 118 11 2011 1941 1990 1981 top-tenth 11 31.18 25.21 5.97 115 13 2011 1941 1990 1981 top-tenth 12 33.49 27.03 6.46 115 13 2011 1941 1990 1981 top-tenth 18 50.09 43.44 6.65 104 24 1918 1941 1990 1987 top-third 24 62.97 54.21 8.76 114 13 1918 1942 1990 1974 top-tenth 36 89.05 81.38 7.67 102 24 1956 2017 1990 1987 top-third 48 112.84 108.50 4.34 82 43 1956 2018 1990 1988 normal 60 144.34 135.53 8.81 96 28 1956 2019 1990 1987 top-third