Arrival= tourism?...

LOL...data is skewed

Get the data off between visitor or tourist visa, before running "tourism".

International, migrated people returning back to their home countries also counted?.
Also, border neighbor workers/visitors/family/kins related....
Data needs to be properly filtered.

You can see via Malaysia's tourism...46.5% arrivals are Singaporeans....
Why?...basically you would know.

Similar to Thailand, being bordered with more countries, Laos, Cambodia, Malaysia...in-out.

eg: Laos-> Thailand, approximately contributes 2 million people
from Malaysia?...4.4 million people.
It would state 24 hours, so...why not?...business trips or just plain going across border for family, friends, relatives for weekends ....