average family sizes การใช้

Since the one-child policy began in the 1970s, average family sizes have shrunk to 3.6 people per family from more than 4.8.
The population, as recorded by the Census of Ireland, peaked in 1996 at approximately 10, 800 and has fallen by about 12 % since then, as falling average family sizes have outpaced residential construction.
So for any prime minister to have lost a child is 1 % and the probability of two successive prime ministers to do that is 1 : 10, 000-so I'd say the odds of this ever happening before in the UK are rather slim-but there are around 200 countries in the world-almost all of them with much worse childhood death rates and almost all with larger average family sizes.