I am looking for data showing how all world countries compare in terms of basic English proficiency.
- In answers, the SAME METRIC should be used for all countries.
- Reasonably recent, at least after year 2000.
- The answer with most countries wins.
Pretty much any metric is welcome, for instance the number of people who passed a given test divided by population with correction for representativeness, or the proportion of the population who can handle a basic English discussion measured by UNICEF or others. The important (and difficult) thing is to have the same metric for all the world.
I am looking for basic proficiency, so at this level British/American English distinctions do not matter.