Another number I always wanted was how many total skydives were made within a given year in th U.S. I don't know if that's kept track of, if DZ's report total jumps monthly, yearly, etc.
If you had that you could make a number of, Total U.S. Skydiving fatalities/Total U.S. Skydives. I heard a 1/100,000 number once and wondered if that's how they got it. >-/o