PE, The short answer is no.
As others have said it is quite difficult to be precise.
If you have always lived in an area with not much influx, then you feel your area is being swamped, maybe you feel that is wrong.
However if during the same time scale, the last half century, you lived in an area, where hardly any new people came in, I doubt you would be bothered.
So, I agree, it is more about personal perception.
But if you were in the second world war, as was my father, your war, after in was over and you moved home, might have been a very, very different war from others.
One of my great uncles was put in a lobster pot for six weeks by the Japanese, he survived, after a lot of his bowels were removed. How do you compare that?
I doubt that uncle was accepting of Japanese.