There are lots of various historical graphics, but the most interesting one to me is the first appearances of each Avenger:
Avengers (1963-2011) First Appearances
Hat tip Flowing Data
See also Disney Pilots $6 Billion Marvel Licensing Machine (Bloomberg)
Please use the comments to demonstrate your own ignorance, unfamiliarity with empirical data and lack of respect for scientific knowledge. Be sure to create straw men and argue against things I have neither said nor implied. If you could repeat previously discredited memes or steer the conversation into irrelevant, off topic discussions, it would be appreciated. Lastly, kindly forgo all civility in your discourse . . . you are, after all, anonymous.