It's not raw, in the sense that it's not an objective measurement. It's a comparison with other humans of the same age that took the same tests. 100 IQ means that you score in a perfectly average way, you're better than 50% of people that took that test and worse than 50% other people that took that test, it's a comparison, not really an absolute score.
So, to compare 100 IQ now with 100 IQ 50 years ago is hard, since you're not using the same test anymore.
There's an effect called the Flynn Effect which is essentially an inflation of IQ, so the tests are changed every few years so that it keeps the same distribution (so that the averagely intelligent human would score 100)
In fact, you can't always compare the IQ tests of 2 humans alive, because the given score is comparing you to the other people of your age, not to the global population. So if you compare the IQ of a kid and middle aged man, it doesn't mean that one is more smart than the other in an absolute way (it's more a theoretical potential)
So, to compare 100 IQ now with 100 IQ 50 years ago is hard, since you're not using the same test anymore.
There's an effect called the Flynn Effect which is essentially an inflation of IQ, so the tests are changed every few years so that it keeps the same distribution (so that the averagely intelligent human would score 100)
https://en.wikipedia.org/wiki/Flynn_effect
In fact, you can't always compare the IQ tests of 2 humans alive, because the given score is comparing you to the other people of your age, not to the global population. So if you compare the IQ of a kid and middle aged man, it doesn't mean that one is more smart than the other in an absolute way (it's more a theoretical potential)