I think www.classes.cs.uchicago.edu/current/22300-1/lectures/FP_history.pdf is a better graph because it focuses more on functional languages and the layout is easier to navigate.
Why did you include Fortran and Algol? I'm curious what warrants their inclusion, but not BASIC or ADA or a variety of other languages... they certainly don't meet the textbook definition of "functional."
