I agree, in fact to go even further the upper limit would also have to be specified. For example 3886 of the 1000000 companies founded in the past 1500 years in

I agree, in fact to go even further the upper limit would also have to be specified. For example 3886 of the 1000000 companies founded in the past 1500 years in Japan have survived giving a 0.3886% survival rate. Since we have no idea how many companies were founded, the survival rate is completely unknown. It would be better to compare a country with a similar age such as China if they want to make an interesting comparison.