haha.nu has a collection of Olympic posters – 1896 to 2012.
Through 1952 only St. Louis, 1924, failed to show some reasonable facsimile of a human particpant. Of the 15 posters from 1956-2012 only 6 show what appears to be any kind of human form.
Are the participants no longer relevant to the idea of fostering international communication and peace and now only a sidelight to the marketing?