Wasn’t he after “Lebensraum” (literally, room in which to live) rather than slaves? If so, surely it would be a matter of national policy to depopulate the captured reasons. Certainly, the Germans made quite a good start on depopulating the areas of Poland and the Soviet Union they captured. In Poland something like 25% of the population died during the war.
Poland was the eastern territory for Hitler. Just like Ukraina, Belorussia and Russia were. The Lebensraum implied depopulation by many different ways (including Holocaust).
Regarding the percentages it is not that clear I guess. It depends in which borders take the countries and if counting by nationalities or not.
This is a quote from wikipedia (http://en.wikipedia.org/wiki/World_War_II_casualties#endnote_Poland): “Losses by ethnic group were 3,100,000 Jews; 2,000,000 ethnic Poles; 500,000 Ukrainians and Belarusians.”
The total population of Poland before 01-sep-1939 was app. 35 million. The Poles were about 25 millions. 3.5 million jews, app. 5 million Ukraininas, app. 1 million Belorussians, app. 1 million Germans.
Most of the poles lived in the area soon to be occupied by Germany.
All of the Ukrainins and belorussians and most of the jews (app. 2 mill) were in area soon to be taken back by USSR.
So the percentage numbers change dramaticaly depending on this factors. If you just remove the stats for 2 millions of jewish population, that was almost completely completely killed during the war, the situation shifts dramaticaly.
But this of course does not show, that Poland was not one of the country that suffered enourmous death rate during WW2.
Best regards
Igor Korenev