Take an example of why this number is probably not as meaningful as you might think. We have only one astronaut. And this astronaut flies on a ship 1000 times. And then on the 1000th time it blows up. Well we had 1 astronaut that flew and he died. So it would be fair to say that 100% of astronauts that flew on our imaginary ship died on it, but it would lack much of any meaning.

Accounting for repeats, there were 833 individuals that flew on the shuttle and 14 died. The ratio there is about 60:1 which is predictably comparable to the ratio of successful:failed flights.