2016 Games voting. This is very interesting:

[jawnbc]

Round One:

• Chicago 18
• Rio 26
• Madrid 28
• Tokyo 22

So Chicago is dropped. It looks like the Asian block supported Tokyo here, and about half the Europeans supported Madrid. Much of the rest of the world and the rest of Europe seemed to go for Rio.

Round Two:

• Madrid 29
• Rio 46
• Tokyo 20

Madrid only picks up one vote! Tokyo loses two votes! Almost all the Chicago votes have gone to Rio--had they received 2 more votes, this would have been the last round.

But it's not unheard of for a candidate city very close to winning on one ballot to be pipped at the post on the next. This is what happened when Vancouver was selected over Pyeonchang for next year's Winter Games.  Bear in mind none of the voting IOC members know the points; like us they only know who was dropped.

Round Three:

• Rio 66
• Madrid 32

Madrid only picks up 3 votes this time--everything else goes to Rio. Thus Rio wins byf the largest margins of victory ever! 

If you're wondering why different voting numbers for each round: no IOC member from a candidate city's country can vote. But if they get dropped (like the US and Japan did here) their members can vote in all subsequent rounds.