Enjoy the work of weeks, done for all municipalities, presented are the provinces and major cities&towns (it was unfortunately not sense-full to include 2021, as the number of municipalities had been drastically reduced):
Concerning the 2 blocs Centre was a problem. But i was able to integrate all relevant parties into either side, thus Left without Centre - "Linke (-Sp)" - delivers You quasi Right inclusive Centre and vice versa.
NoOne should say any longer, that Oslo is still a right city.