2011 report compares adult English proficiency around the world.

[555]

http://www.ef.com/epi/download-full-report/

[Rubber Duck]

Well the twat that came up with the Czech Score must have surveyed Charles Bridge!

[Rubber Duck]

but interestingly only higher than India.

I see the US didn't make the cut!

[yanni]

•42 countries and 2 territories ranked by English proficiency

I don't think the US was included. It seems the grey areas of the map were not ranked.