That is not entirely sport-related, because La Paz, the capital city of Bolivia, is so high in the montains (3829m altitude), that one cannot really breath. They have only one firemen station,as there is no need for more: no oxygen=no fire.
Therefore, Bolivia qualifies almost each and every time (and i do not contest they might have some value, of course): they beat the crap out of Brazil, Argentina and everybody else, but only in La Paz. I dare anybody to try and play while almost not being able to breath.
That, i believe, is the main explination.