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The MacTutor page for the Finnish Mathematical Society provides a reference that contains a list of presidents (and secretaries) of the society: an Arkhimedes article from 1985 called "Fragments of the history of the Finnish Mathematical Society" (Finnish title "Katkelmia Suomen matemaattisen yhdistyksen historiasta").
I don't have access to that article, so I've just included the presidents I could verify. Would be cool if anyone could get hold of it!