A lot more crimes are reported on in the media, where 50 or more years ago it wouldn't get mentioned if it came out in the open in the first place.
Look at all the pedophilia scandals in the Catholic Church. Many of those happened quite some time ago, but the kids were either told to keep their mouths shut or weren't believed in the first place, if they'd dare tell anyone at all. Now the moment it leaks out the media will be all over it.
The level of crime may be similar, at least percentage wise, but you hear more about it now. Also thanks to the internet, which means we can see news from all over the world within minutes after it happened. Rather than a big crime making it to the local newspaper and not beyond (if the local newspaper wasn't owned by a friend of the criminal and kept quiet about it in the first place).
A lot of crimes simply didn't get reported, statistics weren't kept, or the victim was blamed and it was swept under the carpet. Or the victim was killed or locked up in an asylum to keep them from saying anything.