Wow, they are going through some serious gyrations to figure out the rates. You're right, that is some serious chaos. If I get their figures right (kinda hard), it seems like the number of jobs available is greater now than in 1900, but that might take a while more to verify.
After a bit of reading, though, it seems I'm wrong. If this study is to be believed, employment rates around 1900 were quite chaotic.