1924 395.5 24.2 3391 1925 398.7 24.4 3640 1926 403.1 25.0 3567 1927 410.0 25.2 3827 1928 417.4 25.7 3843 1929 430.0 23.0 3928 1930 440.0 22.0 4017 1931 456.0 22.3 3877 1932 455.0 21.4 3922 1933 435.3 22.6 4162 1934 430.5 24.2 4419 1935 441.5 24.2 4656 1936 438.5 24.8 4850