So, not much to report.
1. Have started to develop a system where I begin with National statistics bureau as the best for population, migration etc. (and most accurate)
2. Then move to specific governmental organisations that deal with tourism and/ or immigration.
3. Have found that a pro-active approach is the best, if I am unable to find a source for specific data, I ask!
4. I have been in contact with most of the bureaus and museums to find data that is hard to locate or unavailable online. People have been so helpful and pleased to be able to point me to specific and hard to locate statistics. It has initiated ongoing conversations with some and in rare cases gaps etc.