Country ranking is only based on standard. The way I checked was looking at a country that had very few members and looking at those members profiles. The average PP matched that of the average of the players standard PP. It would be nice if the country ranking could be Added for the other 3 modes
Actually nm I just was looking at countries and all the players in it happened to only have players that had only played standard. When looking at the country of Niger it has 3 unique players but only 1 has played standard and that 1 person only has 1 PP in standard. The other 3 are all in other modes and the average is 325 for the country.
The 3 players are Alkakoo 1PP Standard, 512PP Taiko, 4PP Mania. Madbax 1PP In CTB. Finally Doody Tco who has 463 in Mania. So based on this if we add up the top game mode for each player 512 + 1 +463 & divide by 3 players would get us 325.333 which would round to the number we see. If you just add up all game modes for all players it would average out to 327 so it seems to take the top mode for each player in a country and averages it together and not adding up all PP across all modes.