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There are a number of factors to consider, including improved nutrition, track surfaces, footwear and much research in sports science.   Also, before 1970, only amateurs were allowed to compete in the Olympic Games.

Update: In The Olympic Games 2016 in Brazil Usain Bolt won the Gold medal with 9.81 seconds in the final.

Sources: "The Complete Book of the Olympics" by David Wallechinsky and Jaime Loucky, International Olympic Committee; Amateur Athletic Assocation; Photographs: Chang W. Lee/The New York Times, Getty Images, International Olympic Committee

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