1901-2000 Inches 1 2.50 1.75 0.75 104 25 1976 1931 1956 1952 top-third 2 5.25 4.04 1.21 96 33 1910 1931 1956 1947 top-third 3 7.95 7.71 0.24 75 54 1953 1931 1956 1946 normal 2010 4 11.70 11.55 0.15 67 62 1976 2018 1956 1954 normal 5 15.33 15.41 -0.08 67 62 1976 1993 1956 1954 normal 6 20.10 20.04 0.06 65 64 1976 1993 1956 1954 normal 7 25.04 24.09 0.95 74 55 1976 1993 1956 1954 normal 8 27.56 27.03 0.53 68 61 1910 1993 1956 1954 normal 9 29.44 28.99 0.45 70 59 1910 1993 1956 1954 normal 10 29.78 30.00 -0.22 62 67 1910 1993 1956 1954 normal 11 30.34 30.98 -0.64 60 69 1910 1993 1956 1954 normal 12 30.86 32.08 -1.22 53 75 1910 1993 1956 1954 normal 18 47.44 52.18 -4.74 30 98 1956 2019 1956 1954 bottom-third 24 55.11 64.24 -9.13 10 117 1956 2019 1956 1955 bottom-tenth 36 78.31 96.35 -18.04 1 125 1957 2010 1957 1956 lowest 48 113.11 128.38 -15.27 7 118 1958 2010 1956 1954 bottom-tenth 60 138.74 160.36 -21.62 3 121 1956 2010 1956 1955 bottom-tenth