What are the ejection injury and fatality rates?
Survival outcomes in low level ejections from high performance aircraft is a 2013 consolidation of ten separate studies of ejections from 1952-1997, focused on comparing low level to high level ejections. It doesn't state that these were military (though likely) and only considered those where altitude was known. From the abstract:


  There were 562 low-level ejections identified. Out of this number, there were 274 fatalities, giving a low-level ejection survival rate of 51.2%. There were 2607 ejections that occurred above 500 ft (152 m), with a survival rate of 91.4%. There was a significant difference between ejection survival rates below and above 500 ft (152 m). Low-level ejections have a significantly increased risk of a fatal outcome (Odds Ratio 10.07).


So overall the odds of surviving an ejection are 84%.