Should this question be on-topic? It is asking more about the demographics than the religion.
I think it is. The question is asking about:
What percentage of population do Sufis make up in a special region/country?
It's valid question because:
- It's mainly about the religion or one of its sects.
- It's about population density which is an important aspect of study about every religion.
In my opinion. it totally fits in here.
The site is broad. The question has to do with finding out some information about practitioners of Islam, and it's something that people might presumably find interesting. So I vote it's on-topic but perhaps close to the boundary.
I do not think this is an on-topic question for this site.
This question deals with demographics and data. If you have a question about data, commit to this proposal. It should be off-topic here.