who were the presidents of finland?
k. j. stahlberg, lauri kristian relander, p. e. svinhufvud, kyosti kallio, risto ryti, gustaf mannerheim, j. k. paasikivi, urho kekkonen, mauno koivisto, martti ahtisaari, tarja halonen, sauli niinisto
which presidents served a 3 year term?
kyosti kallio, risto ryti
which of those did not resign due to poor health?
risto ryti