As others have said, I didn't know if it was most or not. I do think it's a substantial amount (20% is substantial, considering the number should be zero, in my

As others have said, I didn't know if it was most or not. I do think it's a substantial amount (20% is substantial, considering the number should be zero, in my opinion). It's certainly a large enough amount that one would see an appreciable difference if one engaged in behaviors that encouraged child bearing, such as child care classes.