1901-2000 Inches 1 2.86 2.78 0.08 74 55 1930 1950,1958 1920 1919 normal 1911,1926,1989,1998,2018 2 5.76 5.70 0.06 57 72 1930 1928 1920 1919 normal 1984 3 8.31 8.62 -0.31 37 92 1988 2015 1918 1920 bottom-third 1955 4 11.10 11.13 -0.03 55 74 1934 2015 1918 1920 normal 5 13.62 13.64 -0.02 56 73 1936 1973 1918 1920 normal 1898 6 15.39 15.78 -0.39 48 81 1934 2019 1918 1920 normal 1959 7 17.50 18.09 -0.59 37 92 1934 2019 1918 1920 bottom-third 1972 8 20.25 20.44 -0.19 53 75 1931 2019 1920 1919 normal 9 22.51 22.66 -0.15 54 74 1934 2019 1918 1920 normal 10 24.68 24.83 -0.15 52 76 1934 2019 1918 1920 normal 11 27.12 27.33 -0.21 54 74 1934 2019 1918 1920 normal 12 30.52 29.95 0.57 69 59 1918 2019 1918 1920 normal 18 46.59 45.74 0.85 72 56 1931 2019 1919 1920 normal 24 61.68 59.92 1.76 85 42 1918 2020 1919 1920 top-third 36 93.37 89.88 3.49 96 30 1956 2019 1920 1909 top-third 48 117.94 119.78 -1.84 40 85 1956 2019 1920 1917 bottom-third 60 144.99 149.64 -4.65 22 102 1934 2019 1918 1920 bottom-third