Finland, Switzerland, Sweden, Australia, Luxembourg, Norway, Canada, Netherlands, Japan and Denmark.
I would have to say that it's because there are (at times) more iSteve readers in Finland per capita than in any other country. I haven't read Newsweek's reasons, but I can't imagine they'll be any more plausible.
By the way, have you ever noticed how many people don't really believe that Switzerland and Sweden are different countries? It's all just Swedzerland or Swiden to them. (My father says his father told him that a lot of Swedes immigrated to Switzerland in the 19th Century, but I can't find any record of this.)