Is the original poster asking for a worldwide number of adult women? the US? the western world?
How can we know beyond self-reported surveys?
I don't think any of us has seen a large enough random sample without all sorts of selection biases.
I think the answer depends on a number of factors including:
Religion - Muslims are supposed to remove all pubic hair. So the more conservative their outer garb, the more likely they are to have shaved/waxed pubes.
Among non-Muslims - I imagine that younger adult women are more likely to be depilated than older ones.
Among naturists, where women can see other women naked, there may be more unconscious fashion following and unconscious peer pressure in going with the herd. So if some women are depilated then the fashion might spread. This is the only segment where there might be enough empirical evidence to answer this question - but only for this segment.
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