This is bad data. Paul Radcliffe, who is a big antidoper voice set the women's marathon record and it's not shown at all.https://twitter.com/paulg/status/1063039383970955265 …
The graph doesn't include events that were introduced part way through the period it covers. The first Olympic women's marathon was in 1984.
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Which alone sets a World Record
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Which is why it's omitted. Otherwise it's just a chart of new events introduced.
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