I guess that's sort of the problem here, I want to but this is not my area of expertise and it happened in my country too long ago for me to tell you much first or second-hand about specific events. Wikipedia is already a far better source for social context info on the events than most people will ever be, because for most places it was so long ago. That's why I think it's important to directly ask the historians / data analysts of the other countries, and the experts in comparative global health policy exactly the same question.
You have asked a really good question and you need good answers from people who really know the topic well.