Note: lowest _new_ covid-19 cases. They're more like the middle of the pack, even above average, in _total_ cases per capita.
Edit: I just notice my link is for confirmed death, and you say confirmed cases https://ourworldindata.org/explorers/coronavirus-data-explor... Sweden is still above the average of Europe.
The problem is that I only look at the death number. It's too difficult to compare the number of cases, because there is a lot of asymptomatic cases, and very mild symptom cases and the detection depends how much each country is testing. Death are more difficult to hide.