Excess mortality still looks substantially higher in Sweden than in Norway and Denmark (though not Finland) in this OWID data set, I wonder why the difference?

Excess mortality still looks substantially higher in Sweden than in Norway and Denmark (though not Finland) in this OWID data set, I wonder why the difference? - https://ourworldindata.org/grapher/excess-deaths-cumulative-per-100k-economist?tab=chart&country=NOR~FIN~SWE~DNK~EST~DEU https://ourworldindata.org/grapher/excess-deaths-cumulative-...