SwedenImmigration of people with darker skin and the tendency of Swedes to spend more time indoors, might be two possible explanations.
sun
Scientists doubt that sunscreen protects against skin cancer
Science"There are no scientific studies that have shown that sunscreen reduces the risk of skin cancer", says Bengt Järvholm, professor of public health at Umeå University.
Health expert: Sunlight more important for health than previously thought
HealthThe sun's bad reputation is “completely undeserved”, says health expert Fredrik Paulún.
Unusually little sunshine this winter in Sweden
SwedenA fifth less sunshine than usual, and Gothenburg was less sunny than Stockholm.