Unfortunately, more recent information is googlebombed with people's lightly supported fluff pieces, so a cursory look didn't turn anything like this up for the 80's, 90's, 00's, and 10's.
Now that I think about it, you can just extrapolate that curve forwards and it matches anecdotal data about the 80's and 90's, reaching a similar smooth face extreme around 1990 to peak beard in the 1890. By that logic, it's a 2-century cycle, and we'll be back to all beards late this century.