All you have to do is say which year the following pictograms come from. These are one of Adam's favourite things about the Olympics, along with logos and mascots. They first appeared in their modern form in 1964 Tokyo games, but have been redesigned many times. These three are in date order.
To enter, email the three years (or venues) to email@example.com and as a tie-break, say which your favourite Olympic mascot is and why. Closing date is December 31st and the answers and winning slogans will appear here in the comments.