Detail 
rectangular-shaped population pyramid
長方形の人口ピラミッド   chōhōkei no jinkō piramiddo
rechteckförmige Bevölkerungspyramide

Links

Emily C. Chiu (2004): The One-Child Policy’s Socio-Demographic Impact - Current Trends and Alternative Policy Projections.
http://undergrad.wharton.upenn.edu/research/scholars/volume1/Chiu-Chinss_One_Child_Policy.pdf
 

Copyright 2012 DIJ