I don't have the stats on that with me. I completely respect the fact that some women make those choices. My wife and I have two children. My wife decided to stay home for an extra six months. We were economically privileged for her to be able to do that. We could live on my salary. Many families don't have that privilege. I respect that choice, but I know that for many women, when the choice is paying $1,500 a month to put their kid in child care and they make less money than their partner in the household, they stay home.
That means their pensions are lower.