I know that women are more likely to be victims of violence in a relationship than men. But what percentage of women have actually been violent in a relationship, and how violent was it?

I know that obviously women are more likely to be victims of violence than men. But what percentage of them have actually been violent in a relationship? I know it's nowhere near as bad as male violence towards females, and I know that females are more often the victims than they are perpetrators. I'm just trying to have a better understanding of this issue. I already know that it goes both ways, but to what extent.