BS”D:
I’m going to agree with Sam here (Say! I like green eggs and ham! I do! I like them, Sam-I-am!? :-), even though I don’t know anything about the percentages (and just from what I have seen). The wife has to commit to the marriage, and from what I have seen in some examples, it is a loss of that commitment from the wife’s side that causes a divorce (Even if the husband did something not right, it doesn’t mean a divorce is required or even recommended). That is yet another reason why a couple needs a Local Rov.
If there is even a hint of abuse, a professional should get involved. That DOES NOT mean the couple should get divorced, etc. but to make sure that everyone (including the children) are safe.
You wouldn’t eat something that is probably Kosher, why would you not at least check out possible abuse.