1901-2000 Inches 1 2.57 2.78 -0.21 54 76 1987 1900 1950 1955 normal 2 7.23 6.08 1.15 105 25 1980 1900 1955 1954 top-third 3 8.51 9.58 -1.07 39 90 1980 1900 1948 1955 bottom-third 1914 4 11.85 13.50 -1.65 33 96 1940 1984 1948 1955 bottom-third 1915,1929 5 14.38 17.21 -2.83 18 111 1948 2006 1948 1955 bottom-third 6 16.21 20.91 -4.70 10 119 1948 2006 1948 1955 bottom-tenth 7 21.00 24.42 -3.42 20 109 1948 2006 1948 1955 bottom-third 8 23.45 28.20 -4.75 14 115 1948 2006 1948 1955 bottom-third 9 26.46 31.94 -5.48 10 119 1948 2006 1948 1955 bottom-tenth 10 29.75 35.34 -5.59 14 115 2002 2006 1948 1955 bottom-third 11 31.80 38.65 -6.85 6 123 2002 2006 1942 1955 bottom-tenth 12 36.30 41.99 -5.69 15 114 2002 2006 1950 1955 bottom-third 18 66.28 62.87 3.41 79 49 2002 2007 1953 1955 normal 24 94.78 83.96 10.82 112 16 1966 2007 1954 1955 top-third 36 141.43 125.88 15.55 112 15 1967 2008 1954 1955 top-third 48 179.08 167.88 11.20 93 33 1968 2009 1953 1955 top-third 60 229.44 209.81 19.63 111 14 1969 2010 1954 1955 top-third