The current three-medal format was introduced at the 1904 Olympics.[250] From 1948 onward, athletes placing fourth, fifth, and sixth have received certificates, which came to be known officially as Olympic diplomas; from 1984, these have also been awarded to the seventh- and eighth-place finishers. At the 2004 Summer Olympics in Athens, the gold, silver, and bronze medal winners were also presented with olive wreaths.[251] The IOC does not keep statistics of medals won on a national level (except for team sports), but the NOCs and the media record medal statistics and use them as a measure of each nation's success.[252]