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https://en.wikipedia.org/wiki/List_of_countries_by_antidepre...
> The OECD have not included the United States in these reviews, but if added the country would have the highest or second-highest rate.
Nordic countries are also not on the top of the list.
This is basically just a list of developed countries where people can afford luxury medication.
It could also be a matter of the seasons in the case of Iceland.