Thanks for the quiz. May I suggest some minor changes? Congo participated in 1974 (just like East Germany) as Zaïre so you might at least accept this answer if not make it the answer itself. Serbia is pretty high on the list because of Yugoslavia record, so why not put Yugoslavia/Serbia (and if you add something to Serbia, might as well be Montenegro since Macedonia never participated, whether with Serbia or alone). Thanks again!
3 pts per game won, 1 pt per draw, obviously 0 pt for a loss. Including every game played be it in group stages or knockout phases, for the whole World Cup history even if the 3 pts/win was only established in 1994. A penalty shootout win count as a draw.