The actual number is like half of that because while 800k people came, about 400k people left.

I am an immigrant myself but I start to think that such policies are short-sighted. The end result is often fragmentation of the society, because immigrants rarely truly integrate, and at some point they become the majority, and then you're effectively a minority in your own country. It takes at least two generations for newcomers to become fully integrated, and that assumes things going right.

The migration numbers are net so I believe this is arrivals minus departures (or someone has a very weird definition of net).