I dunno, seems reasonable to me. Crimes of this nature are underreported, so I tend to assume I’m only aware of a very small percentage of these situations. I’m not saying you’re wrong - just that I had the reaction that it seemed within the general ballpark. For example, most of the apparently normal women I have known well have shared stories of abuse and trauma.
What makes you say it’s hard to measure? The definitions are pretty clear cut.