The first one cites Larmuseau et al. (2016).[0]

> The surprising result of these new studies is that human EPP rates have stayed near- constant at around 1% across several human societies over the past several hundred years.

But this is based on long term population studies, not "real time" measurements.

0) https://sci-hub.tw/10.1016/j.tree.2016.03.004

Anecdotal: in last three generations of my family we had three confirmed incidents of this. It's only what we know. Including my own first marriage (I divorced, though it wasn't a secret, since the marriage de facto already did not exist by that time)

Not 30% but not 1-2 also..