i had a quick glance, now the rankings look like theyre based on the positions based on the rankings of the top100 most beautiful woman.
now to be in the top100 u have to be famous most likely because u are a actress, model, athlete
obviously the US has the greatest number of movies stars etc, hence the number 1 ranking
now if you were to choose the countries that have the best looking females based on the average females looks none of the following would be in the top5
us/uk/canada/oz/brazil
(uk have prolly the worst looking girls in europe, ozzies are ok (until they open their mouths esp if drunk + hunting in packs), us the most obese nation on earth, girls cant be to happy with their looks in brazil or else it wouldnt be the worlds leader in plastic surgery )
realistically yould prolly see denemark + poland + chezch republic up near the top
a fairer metric would be say compare the female soccer/football team of each country or something similar (where ppl are chossen based on their ability + not their looks, or one hopes)