England and Wales 1919 to 1937: sleepy sickness peaked in 1924 (5,039 cases), not after the 1918 flu

Registrar-General's reviews. Influenza deaths per million: 1917 220, 1918 3,078, 1919 1,181, 1920 282, 1921 237, 1922 563, 1923 220, 1924 489, 1925 327, 1926 229, 1927 567, 1928 196, 1929 734, 1930 126, 1931 360, 1932 327, 1933 567, 1934 139, 1935 182, 1936 148, 1937 454. Encephalitis lethargica: notified 541 (1919), 1,470 (1921), 454 (1922), 1,025 (1923), 5,039 (1924), then falling every year to 411 (1934); deaths per million about 7.5 (1919), 19 (1921), 9 (1922), 14 (1923), 36 (1924), 35 (1925), 34 (1926), then slowly down to 17 (1936). In 1918 nearly all deaths were certified under other names. Note: the scan's 1930 influenza count reads 9,019 but its sexes sum to 5,019.