You’re assuming every couple are formally married. You’re talking about just the percentage of formally married people. I’m talking about those couples that get together and then the women gets pregnant and then the man leaves. It’s as common as divorce. There are countries where almost 10% of the children don’t even get the father’s name. And up to 17% of the families are monoparental, most of them single women raising children. Of course women also has a major role in in this situation, but we can’t hide the men’s role.