Okay smartarse, since you obviously didn't actually read the paper it's talking about:
1: it's estimated
2: it's sourced from a 1990 paper, which I haven't bothered to read yet so let me know if it has any profound revelations
3: read the key to the table, specifically (a) and (b) and think about the selection bias in (b)
4: drawing worthwhile conclusions from that terrible page you linked isn't possible
5: I'm going to bed, please read things
Table from the paper:
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