I don't know where the data for these graphics come from and no one will be able to tell you how much people hold or what percentile you are really in.
It depends on your definition of enough. How old you are. Where you live ect. What lifestyle you wish to have.
I wish there was just some magic number where that you could say was "enough" but that does not exist anywhere in life. We always want more and strive for better. How much is "enough" fiat? We seemingly are never fully satisfied.