Oxford, Cambridge, Sweden, Singapore, and Canada (from the comments)
Here’s the data on Swedes at Oxford.
The average acceptance rate for EU applicants was 9.2%. For Swedish applicants it was 3.2%.
For 2013, both Oxford and Cambridge accepted 140 students from Singapore, a country of 3.3 million citizens.
They took 26 from Canada, which has 33 million people.
That is from Chip.