(Animation)The diagram stops in a moment at 1940 because of no data for 1941`1943, and jumps to 1944.
"Previous" and "Next" relate to years of data (See [Transition]). Fluttering in aged groups in 1944 and 1951-1954 is caused by no divisions of 5-year.
Sudden expansion and contraction of 0-4 year group in 1944-1946 follow original data.
(Scale)Unit of scale is 'million persons'.
(Method of taking statistics)The statistics were taken from the civil registration before 1918, from the census result in census year after 1920 and estimation in other years. Attention is to be paid to the scope of Japan's area, people and time of statistics through about past 120 years.
[Source]"Historical Statistics of Japan", October 1987, Japan Statistical Association.@"Population Estimates of Japan", March 1970 and "Population Estimates Series No.36-" March1970-, Annual, Bureau of Statistics, Office of the Prime Minister. These sources are kept in Statistics Bureau of Japan.
[Remarks](a)Decline of young male from about 1937 is caused by their outgoing to external areas and war.(b)Temporary increases of births are seen in about 1948(first babyboom) and about 1973(second babyboom).(c)Tendency of decrease of births and increase of aged began in about 1975.