What fraction of galaxies host active galactic nuclei? I've been saying "some". I can't find a reference for a particular percentage.

This seems to address the question to some extent; https://arxiv.org/abs/astro-ph/0108389 would "roughly 1%" be in the right ballpark for an answer then?

pesa points out this is redshift-dependent. I am looking for a ballpark figure of the fraction of AGN at $z &lt; 1$.
As Pela said in the comment, it is highly redshift dependent so there is no straight answer. "Some" is the safest option.