the obvious questions that arise from a map like this are the following:
1) is this based on attendance at domestic events (or professional leagues etc)
2) is this based on tv viewership (tv ratings or shares during events)
3) is this based on participation ("professional" vs youth vs recreational)
4) is this based on some online popular poll (like those that espn has on their website)
from the map it looks like track and field isnt the "most popular" in any country, but i am sure there are a few countries that it is a close second (likely jamaica, kenya, ethiopia, bahamas) and a few that it might be in the top 5. i would also like to know in which countries it ranks the lowest in relative popularity.