These numbers are to some extent distortions brought about by Sweden having different ways of associating deaths with COVID-19. If you look at overall numbers the Netherlands has similar accounting and similar results. It is also true that if you look along borders such as between Sweden and Norway there is little difference along them. The bulk of cases in Sweden were in very specific communities, in particular immigrants in urban areas and old people in care homes, so the result of this focus on averages per nation ends up being distorted.