The commercial figures are supported by detailed reliability engineering data though and every flight is meticulously logged, none of this "62 give or take" stuff. Exactly how many formal bookings were there and how many no-shows - other than unavoidable due to weather?
If you'd bothered to look at the link I provided a couple of posts up you'd have a pretty good idea!
Here it is again:
Save XH558 - Avro Vulcan Bomber - Flight Information/Air Shows
In the case of a no-show, it tells you why at the bottom, next to the corresponding number.
As I said, it's certainly not bad at all.