It would seem the takeaway here is: In the first 3 months of 2016 famous people died at 2x the rate of previous years. Since then there has been a normal rate

It would seem the takeaway here is: In the first 3 months of 2016 famous people died at 2x the rate of previous years. Since then there has been a normal rate of famous person death. "Quantity of famous people dying" is measured using BBC obituary count (which they admit as in imperfect measure).