1924 8 1.35 1925 8 1.96 1926 9 2.27 1927 10 2.483 1928 11 2.73 1929 11 3.091 1930 12 3.674 1931 16 4.62 1932 18 5.497 1933 19 6.26 1934 20 7.012 1935 21 7.618 1936 22 8.131 1937 23 8.593