1901-2000 Inches 1 1.98 2.13 -0.15 51 79 1947 1998 2009 2010 normal 2 3.63 4.45 -0.82 19 111 1977 1998 2009 2010 bottom-third 3 6.08 6.79 -0.71 26 103 1977 2019 2009 2010 bottom-third 4 8.30 9.02 -0.72 35 94 1977 2019 2009 2010 bottom-third 5 10.27 11.19 -0.92 28 101 1977 2019 2009 2010 bottom-third 6 13.05 13.68 -0.63 42 87 1977 2019 2009 2010 bottom-third 7 15.56 16.31 -0.75 32 97 1977 2019 2002 2010 bottom-third 1970 8 18.88 19.09 -0.21 53 76 1977 2019 2009 2010 normal 9 22.37 22.02 0.35 71 58 1918,1931,1977 2019 2009 2010 normal 10 25.69 24.92 0.77 80 49 1918 2019 2009 2010 normal 11 28.07 27.45 0.62 73 56 1931 2019 2009 2010 normal 12 30.37 29.96 0.41 64 65 1931 2019 2009 2010 normal 18 46.54 43.65 2.89 105 23 1918 2020 2009 2010 top-third 24 64.15 59.92 4.23 109 19 1935 2020 2010 2005 top-third 36 93.86 89.87 3.99 99 28 1957 2020 2010 2006 top-third 48 123.74 119.77 3.97 97 29 1957 2019 2010 2007 top-third 2007 60 153.41 149.63 3.78 85 40 1957 2020 2010 2008 top-third