Answer
Jan Železný broke the world record in javelin throw four times. He first did so in 1987, with a throw of 98.48 m. He then broke the record again in 1988, with a throw of 99.76 m. In 1990, he broke the record yet again, with a throw of 99.82 m. Finally, he broke the record for the fourth and final time in 1992, with a throw of 99.78 m.