1901-2000 Inches 1 3.06 2.78 0.28 89 41 1987 1900 1911 1910 top-third 2013 2 6.34 6.08 0.26 84 46 1980 1900 1911 1910 normal 1937 3 9.60 9.58 0.02 72 57 1980 1900 1911 1909 normal 4 13.60 13.50 0.10 72 57 1940 1984 1911 1910 normal 5 15.76 17.21 -1.45 43 86 1948 2006 1911 1909 bottom-third 6 18.99 20.91 -1.92 34 95 1948 2006 1911 1910 bottom-third 7 22.14 24.42 -2.28 29 100 1948 2006 1911 1910 bottom-third 8 26.54 28.20 -1.66 40 89 1948 2006 1911 1910 bottom-third 9 31.17 31.94 -0.77 51 78 1948 2006 1911 1910 normal 1986 10 31.88 35.34 -3.46 26 103 2002 2006 1911 1910 bottom-third 11 33.07 38.65 -5.58 16 113 2002 2006 1911 1910 bottom-third 12 37.06 41.99 -4.93 21 108 2002 2006 1911 1910 bottom-third 18 51.82 62.87 -11.05 4 124 2002 2007 1906 1911 bottom-tenth 24 70.85 83.96 -13.11 4 124 1966 2007 1912 1911 bottom-tenth 36 113.50 125.88 -12.38 9 118 1967 2008 1906 1911 bottom-tenth 48 152.96 167.88 -14.92 8 118 1968 2009 1907 1911 bottom-tenth 60 200.35 209.81 -9.46 24 101 1969 2010 1908 1911 bottom-third