1901-2000 Inches 1 0.79 1.14 -0.35 31 99 1981 1969 2003 2008 bottom-third 2 3.21 2.39 0.82 108 21 1961 1969 2007 2008 top-third 3 4.89 4.22 0.67 86 43 2003 2016 2008 2006 top-third 4 7.71 6.52 1.19 93 36 1977 2020 2007 2008 top-third 5 11.52 9.90 1.62 92 37 1977 2020 2007 2008 top-third 6 13.40 13.46 -0.06 62 67 1977 2020 2004 2008 normal 7 17.42 17.05 0.37 72 57 1977 2020 2007 2008 normal 8 23.43 21.07 2.36 97 32 1977 2011 2007 2008 top-third 9 26.85 24.46 2.39 94 35 1977 2020 2007 2008 top-third 10 31.14 26.96 4.18 112 17 1977 2020 2008 1994 top-third 11 32.25 28.68 3.57 103 26 1911 2020 2007 2008 top-third 12 33.70 29.70 4.00 107 22 1911 2020 2008 2005 top-third 18 51.56 43.18 8.38 121 7 1911 2020 2008 1994 top-tenth 24 67.32 59.40 7.92 115 13 1931 2020 2008 1994 top-tenth 36 96.50 89.04 7.46 104 23 1935 2020 2008 1996 top-third 48 126.26 118.69 7.57 94 32 1937 2020 2007 2008 top-third 60 160.41 148.35 12.06 103 22 1934 2020 2008 1997 top-third