1901-2000 Inches 1 1.53 2.34 -0.81 21 108 1903 1914 1937 1939 bottom-third 2 2.78 3.51 -0.73 33 96 1980 1921 1936 1939 bottom-third 3 4.64 4.56 0.08 72 57 2011 1921 1939 1938 normal 4 5.30 5.31 -0.01 72 57 2011 1941 1939 1938 normal 5 5.80 6.04 -0.24 69 60 2011 1941 1939 1938 normal 6 6.96 6.68 0.28 83 46 2011 1941 1939 1938 normal 7 7.50 7.29 0.21 79 50 2011 1941 1939 1938 normal 8 8.16 8.03 0.13 76 52 2011 1941 1939 1938 normal 9 8.77 8.68 0.09 78 50 2011 1941 1939 1937 normal 1984 10 9.69 9.81 -0.12 70 58 2011 1941 1939 1938 normal 11 11.48 11.52 -0.04 70 58 2011 1905 1936 1939 normal 12 13.15 13.99 -0.84 57 71 1974 1905 1939 1938 normal 18 19.07 20.68 -1.61 47 81 2013 1942 1935 1939 normal 24 26.18 27.99 -1.81 46 81 1957 1942 1935 1939 normal 36 39.57 41.95 -2.38 43 83 2013 1987 1936 1939 normal 48 54.64 55.92 -1.28 58 67 1954 1988 1937 1939 normal 60 69.13 69.90 -0.77 59 65 1957 1988 1939 1935 normal