The graphic says 'deaths per 100000 worker years.'
Perhaps they've taken either:
Deaths of airline pilots (or 'Aircraft Flight Deck Officers'!)
since airline flying began (and was more dangerous than it is now)
or
deaths of all pilots everywhere since the Wright brothers.
ie: Samual Codys flying circus and comtempories,
Royal Flying Corps Sopwith Camel pilots,etc
Battle of Britain Pilots and Bomber Command aircrew
etc etc
Averaging out the good saftey record of now with the appaling record of some of the above might produce a result like that!
Just an idea!