I'd say there are too many factors to guess. People sitting inside all day in offices and when people get home. Driving everywhere so barely outside at all onl

I'd say there are too many factors to guess. People sitting inside all day in offices and when people get home. Driving everywhere so barely outside at all only briefly. Various levels of skin pigmentation each would block various amounts of sun especially in northern latitudes. Clothing style covering more to block sun exposure to prevent skin damage or prevent skin cancer, or after a skin cancer diagnosis.