That's sort of fascinating. The reign of Jennifer was long! When I was naming my girls, there was a website with a cool graphic showing the popularity of various names. Now, it looks like some of the best features are behind a paywall:
http://www.babynamewizard.com/voyager#prefix=&sw=both&exact=false
I thought it was interesting that "Madison" was a top girls name in many states, but never in Wisconsin.