China came top - and has done so for a number of years. The top spots see the USA and Russia - as well as 'usual suspects' such as the Koreans, Taiwanese. Turkey was placed high this year at number 6 and Iran was 10th.
UK was 17th (way to go), but the UAE was 100 (oops).
(Israel was 23rd - perhaps they didn't choose those genetically better at Maths as eh believes...?

But the Chinese are number 1.. again.
http://official.imo2011.nl/results.aspx
Cheers,
Shafique