"justif[y] [sic] concluding that a figure between 700 and 800 is likely to be near the norm, and that variation in either direction is due on the one hand to epidemic disaster and slow recovery thereafter (1921 (640), 1931 (597), 1941 (630)) or on the other hand to an excess of double enumeration (suggested already by census officers for 1901 and 1911, and possibly for 1951).