Population of the Empire of Japan. Population of Japan proper (Estimates) (1920-1939) : Statistical Yearbook of Imperial Japan 59 (1940) Table 3B

PERIOD: 1920-1939. NOTE: (As of October 1st but as of September 1st in 1923)The population estimates were obtained as follows: (1) For 1921 to 1923, the population estimate is the sum of county- and city-level population estimates obtained by multiplying the de facto population in the Population Census conducted on October 1, 1920, with the average annual population growth rate by gender from 1908 to 1918. (2) For 1924, the difference between the population of Japan overall calculated using the population growth rate by sex in each city and summing up the results and the population overall calculated using the population growth rate by sex for Japan overall was proportionally subtracted from the population of each prefecture; moreover, the population decrease due to the Great Kanto Earthquake on September 1, 1923 was also taken into account. (3) For Taisho 1926 to 1929, the de facto population in the 1920 and 1925 Population Censuses is used to obtain the annual average geometric growth rate of Japan's population overall, which is then used to estimate the population. (4) For 1931 to 1934, the same procedure is employed using the de facto population in the 1920 and 1930 Population Censuses. (5) From 1926 onward, the population estimates are obtained by adding the increase in the difference between births and deaths up to each estimation year in the 1935 Population Census using the results of the Vital Statistics survey. SOURCE: [Survey by the Statistics Bureau, Imperial Cabinet].

时期：1920-1939。备注：（截至1923年9月1日，但1923年1月1日起为9月1日）人口估算的获取方式如下：（1）1921年至1923年，人口估算为实际人口普查于1920年10月1日进行的实际人口数与1908年至1918年按性别计算的年平均人口增长率之乘积得到的县及城市级别人口估算之和。（2）1924年，通过按性别计算的各城市人口增长率计算得出的日本总人口与按性别计算的日本总体人口增长率计算得出的总人口之间的差值，按比例从各道的总人口中扣除；此外，1923年9月1日关东大地震导致的人口减少也被考虑在内。（3）1926年至1929年大正时期，利用1920年和1925年人口普查的实际人口数据，获取日本总体人口的年度平均几何增长率，进而估算人口。（4）1931年至1934年，采用与上述相同的方法，利用1920年和1930年人口普查的实际人口数据。（5）自1926年起，通过将1935年人口普查中直至估算年份的出生与死亡差额的增加量与生命统计调查的结果相加，获得人口估算。来源：[帝国内阁统计局调查]