It depends. I voted maybe.
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It depends. I voted maybe.
Worldwide, green eyes are the rarest, overall 2% only. Nevertheless, in Northern Europe pure green eyes are relatively common though are surpassed by blue and gray eyes. It isn't just in the British Islands, but also in Iceland, Scandinavia, the Baltic region and nearby areas such as the Netherlands, Northern Germany etc...
Afghanistan doesn't rival Northern European countries! Yes there are some of them who are green-eyed but the population by far is predominantly brown-eyed!
There seem to be a correlation with red hair, green eyes and a very pale skin, since this coloring combination is most common in Celtic countries. Ireland most likely has the highest frequency for green eyes.
Lies! Lies! Bloody, you are the one with he child book. The Baltic States (particularly Estonia and Latvia) are well among the blondest and light-eyed countries in the world! In these characteristics these nations are very similar to the Scandinavian countries in pigmentation than any other nations including the Netherlands and Germany (including it's northern region). "True blondism" (blond hair + blue/gray eyes + fair skin) probably originates in the Baltic region. Though facially they don't resemble Scandinavians much, rather look like East/North Slavs, the difference is that the Dutch and North Germans look more similar facially to Scandinavians than the Balts but they are not blonder than them.
Blond hair %:
Northern Germany - 43%
Germany - 26%
Northern Netherlands - 41.2%
Netherlands - 32.3%
vs
Estonia - 48.7%
Latvia - 44.5%
Lithuania - 39.3%
Yes, Austria is blonder-haired than Croatia, anywhere between 20%-30% of them are naturally blond similar to the southern parts of Germany. In England due to the Anglo-Saxon invasion, the general range is between 30%-40% but it is lower in the Celtic Fringe in Scotland (26.1%) and Wales (22.5%), so for the U.K. the overall frequency is 25%-27%. Additionally to blond hair, red hair is also common in Great Britain unlike in Germany and Austria where it is less frequent. Red hair is most common in the Celtic fringe and Northern England.