In 1989 the IAAF introduced random drug testing.pic.twitter.com/53ybBQa2n8
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Are you sure this graph is accurate? This seems to indicate zero world records set by women for every year but 2003, but that is definitely wrong. At least five were set in 2005, for instance (e.g. the best marathon time was set by Paula Radcliffe).
It's from this article: https://www.abc.net.au/news/2012-07-25/jericho-olympics/4151414 … It doesn't include events introduced part way through the period it covers.
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Hard to tell without looking at the graph's source data, but that would still be wrong. For instance, marathons existed at the beginning of the period covered, and the previous example I mentioned was an example of a marathon world record in 2005, but that's a zero on the graph.
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I would guess what the IAAF counts as an event roughly tracks what the Olympics count, and the Olympics introduced the women's marathon in 1984. If you want more detail, why not ask the author of the article?
End of conversation
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