Add to the docs of the Korean family:
- The survey has information about the current method of family planning, which could be none. The current one is on 1974.
- But then, it also includes a set of twelve questions asking about their historical use, in other words, what they used in the past, before the current (1964 - 1973).
- This can be used to generate an adoption/disadoption dataset.
Add to the docs of the Korean family: