1901-2000 Inches 1 6.72 7.40 -0.68 37 92 1932 2013 1987 1988 bottom-third 1958 2 15.28 14.28 1.00 81 48 1931 2013 1988 1982 normal 3 18.01 18.26 -0.25 59 70 1931 1906 1988 1984 normal 4 20.72 21.28 -0.56 53 76 1998 1991 1988 1984 normal 5 23.96 24.97 -1.01 50 79 2006 1991 1988 1987 normal 6 25.02 28.12 -3.10 33 96 2000 1959 1986 1988 bottom-third 7 26.87 31.08 -4.21 29 100 1898 1991 1985 1988 bottom-third 8 28.15 33.81 -5.66 20 108 2000 1991 1985 1988 bottom-third 9 31.70 36.13 -4.43 29 99 2000 1991 1985 1988 bottom-third 10 33.47 40.00 -6.53 22 106 1898 1959 1985 1988 bottom-third 11 41.74 46.50 -4.76 29 99 2011 1948 1985 1988 bottom-third 12 50.25 53.67 -3.42 39 89 1981 1948 1988 1987 bottom-third 18 75.37 81.97 -6.60 26 102 2007 1948,1960 1985 1988 bottom-third 24 99.81 107.51 -7.70 29 98 1956 1960 1986 1988 bottom-third 36 156.20 161.48 -5.28 37 89 2008 1960 1987 1988 bottom-third 48 211.13 215.31 -4.18 51 74 2009 1960 1988 1987 normal 60 252.40 269.10 -16.70 6 118 1911 1961 1918 1988 bottom-tenth