In another 20 years, when the immigration balances do not look like they do today...
...and when you are pointed at the statistic, will you say: "This statistic is meaningless here."? Or "What this actually has to do with how" successful a country "is, is anybody's guess."?
And I particularly love the way you can switch from "per capita statistics are meaningless and invented by Satan himself or a Kennedy" to "per capita statistics prove my case quite smartly" without blinking an eye.