@ohworm in my old university there are a handful of unions where this is the largest one: https://www.uskar.se/eng
Organisation is high since it's also the main social organisation for students, through the "nations" that make up the union, membership of which are nominally based on which county you are from.
When I was a student the organisation rate was 100 % since you had to be a member of a student union to register to courses.
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