Argentina was #16 overall and #1 in Latin America. As an American living in Argentina I think that sounds about right. Knowledge of English is definitely more widespread here than in other countries in Latin America that I'm familiar with, particularly in Buenos Aires.
Uruguay did not have enough data to be listed, but the years I took the Cambridge and Oxford language tests (FCE, Proficiency, etc.), Uruguayans were in the top spots (the #1 overall got a scholarship to Oxford, and she was Uruguayan).
Of course, the demographics very much the same as Argentina's so it wouldn't be a big difference (we're not an Argentinian province by political accident and meddling by Britain - not that we mind :) ).
I believe it. I know quite a few developers from there and aside from being quite talented at what they do, their English is excellent. But having spent little more than a weekend in the country I didn't want to assume they were a representative sample. :)
